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Article

Amending Subsoil with Composted Poultry Litter-I: Effects on Soil Physical and Chemical Properties

by
Mili Mandal
1,2,
Rakesh S. Chandran
1,* and
John C. Sencindiver
1
1
Division of Plant & Soil Sciences, West Virginia University, Morgantown, WV 26506-6108, USA
2
Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, NJ 08854, USA
*
Author to whom correspondence should be addressed.
Agronomy 2013, 3(4), 657-669; https://0-doi-org.brum.beds.ac.uk/10.3390/agronomy3040657
Submission received: 14 August 2013 / Revised: 14 September 2013 / Accepted: 29 September 2013 / Published: 21 October 2013
Browse Figures
Versions Notes

Abstract

:
During construction disturbance, topsoil is often removed and turfgrasses are established in poor soils. Our study determined the effects of amending subsoil with composted poultry litter on physical and chemical properties that affect turfgrass growth attributes. To simulate typical disturbance conditions, 20 cm of topsoil was removed from a Dormont silt loam (fine-loamy, mixed, superactive, mesic Oxyaquic Hapludalfs) and composted poultry litter was incorporated at 0.1, or 0.2, or 0.4 cm/cm-soil into the exposed subsoil to a depth of 12.7 cm before growing turf. Composted plots were compared to N-fertilized (50 × 10−4 kg m−2) and control plots. Linear increases in total water content, organic matter, pH, and basic cations were observed following compost incorporation. Composted poultry litter increased total water content by 38% and decreased soil bulk density by 42%. Compost applications increased organic matter by 5.8%–6.4%, along with an increase in pH from 6.0–7.4. The cation exchange capacity increased up to 186% in compost-incorporated plots. No differences were observed between fertilized and control plots for all soil properties except for P levels, which increased in fertilized plots. Overall, compost treatments improved soil physical and chemical properties compared to conventionally fertilized and control plots.

1. Introduction

Topsoil on sloping landscapes in the Appalachian region is often thin, rocky and infertile [1]. The topsoil is usually lost or is mixed with subsoil during the construction process. Lawns established under such conditions are not healthy and may be vulnerable to pest problems. Amending such soils with suitable composts may improve the medium for turfgrass growth. Composted poultry litter (CPL) contains several plant macronutrients and micronutrients and has been considered as a valuable soil amendment to enhance soil fertility, organic matter, and tilth [2,3,4,5,6]. Improper use and disposal of poultry litter may have detrimental effects on environment and human health. Instances of diseases such as methemoglobinemia, cancer, and respiratory illness have occasionally been attributed to NO3− leaching from poultry litter [5,7,8]. Other undesirable attributes such as eutrophication, production of phytotoxic substances, air pollution, and emission of ozone depleting gases have also been associated with improper disposal of this waste product [7].
Composting may mitigate the environmental problems associated with the application of raw poultry litter and may provide a beneficial method for handling this waste product of the poultry industry. Along with the reduction in odor, pathogens, and weeds, composting also immobilizes highly mobile NO3− in the litter to its slow-release form [9,10,11]. It is also easier to handle, store, transport, and apply litter that has been composted [12]. Composting also reduces total phosphorus (P), due to dilution of manure with woodchips and straw [13].
Considerable data on the effect of various organic materials on soil physical and chemical properties are available. Sewage sludge reduced bulk density and increased soil water content, available water, CEC, and soil pH [14,15]. Municipal solid waste increased nutrient and water retention capacity, total pore space, and aggregate stability, and decreased cone penetration resistance and bulk density [16,17]. Cattle feedlot litter increased soil organic carbon and water stable aggregates, and decreased bulk density and hydraulic conductivity of disturbed soils [18]. Application of poultry litter on pasture soils over a 20-yr period altered soil properties (pH, electric conductivity, and bulk density) macrocation levels (Ca, K, Mg and Na levels), and increased hay yields [19]. In this study, the authors also noted that the labile form of phosphorus increased following long-term sequential application of poultry litter. Similar conclusions were drawn by Gascho and Hubbard [20] when broiler litter was used to amend soils over a 5-yr period.
The effects of different types of compost materials as an amendment for lawns and other types of turf have been well documented [21,22,23,24,25]. While sequential applications of poultry litter over multiple years may result in undesirable effects to the environment, single incorporation of the same as compost to the subsoil may be beneficial. Limited information is available on the effect of composted poultry litter (CPL) on infertile subsoil as it relates to turf production. The objective of this experiment was to evaluate the changes in physical and chemical properties of subsoil as a result of using CPL as a soil amendment. In a related field experiment, the effects of amending a subsoil using CPL on the growth attributes of Kentucky bluegrasss (Poa pratensis L.) and weed populations were investigated [26]. Turfgrass was chosen as the plant material due to its ubiquitous nature in the landscape typically established in housing and other developments with poor soil quality and a minimal A-horizon.

2. Results and Discussion

2.1. Soil Physical Properties

2.1.1. Total Water Content and Soil Organic Matter

The subsoil was determined to be a silt loam. The effects of compost rates on total water content, θT, are presented in Figure 1. For both seeded and sodded treatments, percent soil water content was higher in compost-treated plots than in fertilized and control plots and increased linearly with percent compost (sodded, R2 = 0.95; seeded, R2 = 0.73). There was an increase in organic matter content due to initial addition of CPL into the subsoil (sodded R2 = 0.94; seeded R2 = 0.98) but differences in the same could not be determined with subsequent incorporation rates of CPL (Figure 2).
The increases in θT may be associated with the increase in organic matter and its effect on soil physical properties. Organic matter is capable of absorbing up to 20 times its weight of water [27]. This ability is related to the large number of hydrophilic aromatic and aliphatic compounds in the organic matter structure [28]. Organic matter also acts as a cementing agent between soil particles, thereby improving aggregation and increasing porosity [27]. This process of aggregation improves water infiltration, soil tilth, and subsequently plant growth especially in loamy soils.
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Figure 1. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on percent total water content (θT) by volume for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments); † values for standard error were small ranging between 0.085 (min.) to 0.553 (max.) and hence are not shown in figure.
Figure 1. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on percent total water content (θT) by volume for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments); † values for standard error were small ranging between 0.085 (min.) to 0.553 (max.) and hence are not shown in figure.
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Figure 2. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on organic matter for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
Figure 2. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on organic matter for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
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2.1.2. Available Water Capacity and Soil Bulk Density

A linear negative relationship (sodded, R2 = 0.89; seeded, R2 = 0.97) was observed between percent compost and available water, Av (Figure 3). As percent compost increased, Av decreased (Figure 3) whereas the total amount of water in soil increased (Figure 1). This suggests that the higher the compost rate, the larger is the total volume of water held by soils and lower is the volume available for plant uptake which indicates that more water is retained by soil particles.
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Figure 3. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on available water, Av for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
Figure 3. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on available water, Av for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
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In this study, we determined both θT, and Av, since each measured a different pool of water. Soil water content measures the total amount of water held by soil (θT = Av + Unvailable) whereas Av determines the amount of water that can be extracted by plants. This water is held between field capacity and wilting point by capillary forces [29].
Organic matter addition has been reported to increase Av only in coarse textured soils with <15% clay. With soils having >15% clay such as the soil used in this study (24% clay), factors other than organic matter determine Av [30]. Reports on the effects of compost on Av ranged from increase, decrease, and no change of Av with compost additions, and, were related to variation in the soil physical properties such as texture, pore size distribution [5], percent clay and structure [30], and bulk density [31,32].
Angle et al., [33] reported an increase in θT of soil with increased rate of sludge compost but observed no effect on Av. Jamison and Kroth [34] attributed the changes in Av to the increase in either percent silt or clay and their effect on pore size distribution. They concluded that the clay particles in silt loam soils with more than 20% clay reduced the water storage by diluting the soil mass and shifting the pore size distribution towards smaller pores, where more water is held in the unavailable range. Metzger and Yaron [35] observed an increase in Av of sandy soils, whereas that of a loamy soil remained unchanged upon addition of sludge. MacRae and Mehuys [36] reported a decrease in Av in silt loam following the addition of peat at different rates.
Stevenson [37] explained that the net result of addition of organic material on Av depends on the relative changes in percent water by weight of soil (W15–W1/3) and decreases of bulk densities dictated by soil type. For silt loam, he associated the decrease in Av (at 0.3 × 105 Pa) to a consistent decrease in soil bulk density with peat moss addition. These observations agree with our results (Figure 4). We recorded a decrease in Av of a silt loam from addition of CPL along with a decrease in bulk density (Figure 3 and Figure 4).
Soil bulk density decreased linearly, up to 42% with 40% compost, with increasing rates of compost (sodded, R2 = 0.98; seeded, R2 = 0.97) (Figure 4). Decrease in bulk density is generally associated with the low particle density of organic matter, which when mixed with the mineral fractions of soils greatly improves aggregation and porosity [36]. The reduction in the soil bulk density with organic material addition is also related to factors such as compost application rate, soil type, and extent of soil compaction [37]. Wei et al. [38] also observed a 6.3% decrease in bulk density of silty clay loam by the application of sludge compost at 1.34 × 10−8 kg m−2.

2.2. Soil Chemical Properties

The subsoil was determined to have a pH of 6.0 and CEC of 11 cmolc kg−1. The addition of CPL to subsoil increased its pH linearly (sodded, R2 = 0.97, seeded, R2 = 0.84) from 6.0 (control) to 7.4 (0.4 cm-compost/cm-soil) (Figure 5). An increase in the availability of soil basic cations also was observed as a result of compost addition (Table 1). These effects may be explained by the initial high pH of 8.3 of CPL and its high basic cation content (Table 1) and a possible increase in availability of inherent cations associated with the pH change. Increases in soil pH through compost application (poultry litter) were also reported by Rasnake and Murdock [39]. They attributed this increase to the high Ca content of poultry litter and its effect on exchangeable soil Ca. However, in a more recent study, application of broiler litter had no effect on total soil pH nor was there any interaction between broiler litter rate and depth [20].
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Figure 4. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on soil bulk density for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
Figure 4. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on soil bulk density for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
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Figure 5. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on soil pH for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
Figure 5. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on soil pH for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments).
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Table
Table 1. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on its mineral nutrient content; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05).
Table 1. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on its mineral nutrient content; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05).
Treatment (cm-compost/cm-soil)PKCaMg
Seeded
--------- ppm -----------
Compost (0.1)0.227 a*1.306 ab4.879 bc0.620 b
Compost (0.2)0.232 a1.915 a7.606 b0.919 b
Compost (0.4)0.241 a2.337 a9.087 a1.671 a
Fertilizer (0.0)0.110 b1.28 b2.661 bcd0.255 bc
Control (0.0)0.101 b0.245 b2.708 bcd0.288 bc
Sodded
--------- ppm -----------
Compost (0.1)0.227 a0.738 b4.442 b0.581 bc
Compost (0.2)0.237 a1.236 b7.044 a0.946 b
Compost (0.4)0.240 a2.291 a7.929 a1.530 a
Fertilizer (0.0)0.091 b0.158 bc2.156 bc0.264 bcd
Control (0.0)0.055 bc.259 bc2.266 bc0.250 bcd
Control plots had higher pH (6.0) compared to fertilized plots (5.9) (Figure 5). The decrease in pH of fertilized plots can be attributed to the application of fertilizer with a composition of NH4-N (4.7%), urea (8.3%), other water soluble N (6.4%), and water insoluble N (0.6%). NH4-N fertilizers are known to decrease pH through leaching of basic cations and production of H+ as a result of nitrification [40]. In this study, leaching of basic cations and the resultant exchange with NH4+ ions was most likely responsible for the lowering of pH in fertilized plots. Our results are consistent with those of Rasnake and Murdock [39] and Eghball [2] who reported a decrease in pH from 6.7–6.3 and 6.4–5.6 respectively, following NH4-N fertilizer applications.
Soil CEC increased from 11 cmolc kg−1 (control) to an average of 28 cmolc kg−1 with increasing rates of compost application (Figure 6). This can be explained by both the increase in the amount of organic matter due to CPL addition and the concomitant increase in pH and available cations (Figure 5). The CEC of organic matter ranges from 100–300 cmolc kg−1, [29]. The effect of pH on CEC is most prominent in soils with a significant amount of pH-dependent clays. In our study, the mineralogical composition of soil was not determined, but based on the low CEC of control plots (11 cmolc kg−1) we believe that it is mostly formed of pH-dependent clays. Gao and Chang [3] also observed increases in CEC following cattle feedlot manure applications and attributed this increase mainly to the increase in organic matter.
In general, the addition of CPL to subsoil improved its nutrient content (Table 1). Higher concentrations of P, K, Mg and Ca were observed at the high (40%) compost rate for both seeded and sodded plots. This increase in nutrient content also reflects the rich nutrient composition of composted poultry litter. Levels of basic cations (Ca, K, and Mg) increased linearly and consequently increased base saturation. Gagnon [41] reported an increase of 60% in available soil P treated with poultry litter as compared with other on-farm and industrial composts. Significantly larger increases in soil P (from 52%–240%) were reported by Balkcom et al. [42]. These increases are due to relatively high content of total P in poultry litter. In studies by Gascho and Hubbard [20], soil P and Ca levels also increased with broiler litter application, while soil K levels decreased. Decrease in soil K was attributed to crop uptake. Our studies demonstrate that composted poultry litter can be used successfully to improve soils where turfgrasses are established in poor subsoil, typically encountered in suburbia.
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Figure 6. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on cation exchange capacity (CEC) for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments); † values for standard error were small ranging between 0.065 (min.) to 0.443 (max.) and hence are not shown in figure.
Figure 6. Effect of incorporating composted poultry litter into top 12.7 cm of subsoil on cation exchange capacity (CEC) for ● sodded compost; ○ sodded fertilizer; ▼ seeded compost; and ▽ seeded fertilizer plots; * Means with same letters are statistically insignificant based on Fisher’s Protected LSD test (P ≤ 0.05) (italicized statistics correspond to sodded treatments); † values for standard error were small ranging between 0.065 (min.) to 0.443 (max.) and hence are not shown in figure.
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Positive linear increases in θT, organic matter, pH, CEC, and mineral nutrient content were observed with a linear decrease in soil bulk density and Av by composted poultry litter incorporation. Improvement in physical and chemical properties of subsoil could be attributed to its dual role of supplying organic matter and essential nutrients, and raising the soil pH thereby releasing more cations. Both the amount and composition of organic matter added to the soil affect the extent to which its physical and chemical properties are modified. These results demonstrate that composted poultry litter can be used to enhance the soil physical and chemical properties of eroded or disturbed soils. Amending soils with organic wastes can have two advantages; apart from managing the disposal problem it can also improve soil nutrient and organic matter content.

3. Experimental Section

Experimental Site: Field experiments were established in fall 2003 at the West Virginia University, Agronomy Farm, Morgantown (39.66N, 79.90W). The soil was a Dormont silt loam (fine-loamy, mixed, superactive, mesic Oxyaquic Hapludalfs). To simulate construction disturbance existing topsoil containing the A-horizon was removed (to a depth of 20 cm) and the subsoil was exposed. The exposed subsoil was tilled uniformly to a depth of 12.7 cm using a rototiller and plots 4.6 m × 3.1 m separated by 0.6 m alleyways were delineated. The compost utilized for the experiments was derived from poultry litter with wood chips and cardboard as a primary source of carbon with a ratio of 2:2:2 (N, P2O5, K2O) (Borderline LLC, Baker, WV). Treatments consisted of CPL incorporated to a depth of 12.7 cm at rates of 0.1 cm-compost/cm-soil, 0.2 cm-compost/cm-soil, and 0.4 cm-compost/cm-soil (equivalent to 4.3 kg m−2, 8.75 kg m−2, and 17.5 kg m−2, respectively), control (untreated), and fertilized plots (N, P2O5, K2O fertilizer 20-27-5; applied at 50 × 10−4 kg m−2). The three compost treatments provided N at 0.086, 0.172, and 0.34 kg m−2, whereas the fertilizer treatment provided N at 0.001 kg m−2. The fertilizer was applied using a drop spreader and incorporated lightly (1 cm) into the soil using a rake. Based on the different depths to which the compost and the fertilizer treatments were incorporated, it was estimated that the compost provided N at 6.77× 10−7 kg cm−3 whereas the fertilizer provided N at 10−7 kg cm−3
The experimental design was a randomized complete block with turf type (seeded or sodded) and amendment treatments arranged factorially. All the treatments were replicated four times. Twenty plots were seeded on 7 October 2003 with Kentucky bluegrass seeds (Scotts “Classic”; 97.75% Kentucky bluegrass, 0.05% other crop seeds, 2.11% inert matter, 0.09% weed seeds) at the rate of 50 × 10−4 kg m−2 using a drop spreader. Seeded plots were covered with straw mulch in order to retain soil moisture and to offer protection from predators. The 20 remaining plots were sodded with Kentucky bluegrass manually on 10 October 2003 with sod (from Rich Farm, Smithfield, PA, USA). Plots were irrigated uniformly as needed during establishment. After establishment, the turf was maintained at a height of 7.6 cm using a reel-mower and clippings removed. Rainfall data were collected during the months of May through September 2004 (Table 2).
Table
Table 2. Precipitation recorded from May to September in 2004.
Table 2. Precipitation recorded from May to September in 2004.
MonthPrecipitation amount (cm)
May13.36
June12.45
July9.02
August16.23
September17.07
Total68.12
Soil Analysis: Soil samples were collected twice at a depth of 20.3 cm from each plot during the study using a soil probe. At each sampling time, 7–8 subsamples were collected from random locations within each plot and were mixed thoroughly to make one composite sample. Samples collected during February 2004 were air dried, machine ground and sieved through a 2-mm screen, and were analyzed for CEC and levels of extractable Ca, P, Mg, and K. Soil samples were collected again as described above during January 2005 and were manually cleaned for any pebbles and debris and then air dried, hand ground, sieved through a 2-mm screen was used to analyze available water and organic matter content. The pH in water was measured with a glass electrode using a 1:1 soil/water ratio [43]. Soil organic matter (OM) was determined by the loss on ignition method (LOI) [44]. The LOI was corrected for dehydroxylation of inorganic constituents through regression analysis prior to determination of the actual OM content. The following equation derived from the Walkley Black method was used to correct for soil types in Northeast and North Central states [44].
OM = [(0.8 × LOI%) − 0.23]
The CEC was determined by ammonium acetate–Kjeldahl method (1.0 N NH4OAc, pH 7.0) [45]. Calcium, Mg, K and, P were extracted using the Mehlich 1 procedure [46]. Calcium, P, and Mg were determined using inductively coupled plasma (ICP). Potassium was measured with atomic absorption spectrophotometry (Perkin Elmer Model 100, Perkin Elmer Corp., Norwalk, CT, USA).
Soil texture was determined using the pipette method [47]. Non-disturbed soil cores of known volume (3.47 × 10−4 m3) were collected to determine bulk density using a hammer-driven core sampler. Bulk density was determined by measuring the mass (dried at 105 °C) and volume of soil in each core. To determine available water (Av), soil samples were saturated with distilled water and desorbed at 3.3 × 104 and 1.5 × 106 Pa pressure using the pressure plate method [48]. To determine total water content, fresh soil samples of known volume (3.47 × 10−4 m3) were taken from the field and their moist weights were recorded immediately. Samples were kept in an oven at 105 °C for 48 h and the dry weight was recorded.
Data Analysis: Analysis of variance was used to analyze the data using PROC GLMTM procedure of the Statistical Analysis System (SAS Institute, 2002). Fisher’s Protected Least Significant Difference (LSD) test, with a probability value of 0.05, was used to separate treatment means.

4. Conclusions

In conclusion, our research determined that physical and chemical characteristics of subsoil, that govern turfgrass growth, could be improved significantly by composted poultry litter incorporation. Various field studies have demonstrated the benefits and risks of poultry litter application to soils used to grow food and fiber crops. In our experiment, composted poultry litter incorporation into a silt-loam subsoil, used to grow turfgrasses, improved its physical and chemical properties. Specifically, increases in total water content, organic matter, pH, and cation exchange capacity were noted following incorporation of the compost material. Overall, compost treatments were able to significantly improve soil physical and chemical properties compared to conventionally fertilized and control plots.

Acknowledgments

The experiment was funded through USDA Hatch Project no. 438. The authors wish to thank Borderline LLC., for their generous donation of compost materials used in this experiment.

Conflicts of Interest

The authors declare no conflict of interest.

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MDPI and ACS Style

Mandal, M.; Chandran, R.S.; Sencindiver, J.C. Amending Subsoil with Composted Poultry Litter-I: Effects on Soil Physical and Chemical Properties. Agronomy 2013, 3, 657-669. https://0-doi-org.brum.beds.ac.uk/10.3390/agronomy3040657

AMA Style

Mandal M, Chandran RS, Sencindiver JC. Amending Subsoil with Composted Poultry Litter-I: Effects on Soil Physical and Chemical Properties. Agronomy. 2013; 3(4):657-669. https://0-doi-org.brum.beds.ac.uk/10.3390/agronomy3040657

Chicago/Turabian Style

Mandal, Mili, Rakesh S. Chandran, and John C. Sencindiver. 2013. "Amending Subsoil with Composted Poultry Litter-I: Effects on Soil Physical and Chemical Properties" Agronomy 3, no. 4: 657-669. https://0-doi-org.brum.beds.ac.uk/10.3390/agronomy3040657

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