Phosphorus Fractions in Soil with Organic and Mineral Fertilization in Integrated Crop-Livestock System

Abstract

Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroférrico) in a randomized block design, using a 5 × 3 + 1 factorial scheme, with four replicates. The treatments consisted of three organic fertilizers (poultry litter, pig slurry, and compost) and two mineral fertilizers (M1, equivalent to pig slurry; and M2, equivalent to poultry litter) in interaction with three application rates, corresponding to 75, 100, and 150 % of the fertilizer recommendation for the crop of interest and a control (with no fertilizer). Soil sampling was performed in the 0.00-0.05, 0.05-0.10, and 0.10-0.20 m layers for determination of the phosphorus fractions. Successive use of organic or mineral fertilizers for six years in the iCL system considerably raises the labile and moderately labile P fractions up to the 0.20 m depth and, with less intensity, raises the non-labile fractions up to the 0.10 m depth. The soil P increase associated with fertilizer input raises soybean and corn yields, and it does not exceed the critical P limit according to local environmental legislation.

Tillage, green manure and residue retention improves aggregate-associated phosphorus fractions under rice–wheat cropping

“…Soil P transformations vary depending on the soil type and management practices 11 . Moreover, the continuous application of phosphate fertilizers has led to serious environmental threats including acidification, hardening and P leaching from the soil 12 . The sustainability of conventional RWS based on intensive tillage is threatened by the scarcity of water, energy and labour, higher production cost and environmental pollution due to the burning of crop residues and deteriorating soil health 7 , 13 , 14 and emerging challenges associate with climate change 15 , 16 .…”

Tillage, Green Manure And Residue Retention Improve Aggregate-Associated Phosphorus Fractions Under Rice-Wheat Cropping

“…Soil P transformations vary depending upon the soil type and management practices (Sharma et al, 2014). Moreover, the continuous application of phosphate fertilizers has led to the serious environmental threats including acidi cation, hardening and P leaching from the soil (Rigo et al, 2019).…”