Effects of Organic Amendments on Soil Physical Attributes and Aggregate-Associated Phosphorus Under Long-Term Rice-Wheat Cropping

doi:10.1016/S1002-0160(17)60423-5

Pedosphere

Volume 28, Issue 5, October 2018, Pages 823-832

https://doi.org/10.1016/S1002-0160(17)60423-5 Get rights and content

Abstract

The quantification of phosphorus (P) in bulk soil and P distribution in different size fractions of water-stable aggregates (WSAs) are important for assessing potential P loss through runoff. We evaluated available and total P distribution within WSAs of a sitty clay to clay soil in a long-term fertility experiment of a rice-wheat cropping system in India. Surface soil samples were collected from seven plots amended with NPK fertilizers in combination with or without organic amendments, farmyard manure (FYM), green manure (GM), and paddy straw (PS). The plot with no NPK fertilizers or organic amendments was set as a control. The soil samples were separated by wet sieving into four soil aggregate size fractions: large macroaggregates (> 2.0 mm), small macroaggregates (0.25–2.0 mm), fine microaggregates (0.05–0.25 mm), and a silt + clay-sized fraction (< 0.05 mm). Structural indices were higher in the soil receiving organic amendments than in the soil receiving inorganic fertilizer alone. Organically amended soil had a higher proportion of stable macroaggregates than the control and the soil receiving inorganic fertilizer alone, which were rich in microaggregates. Total and available P contents within WSAs were inversely related to the aggregate size, irrespective of treatment. The distribution of available and total P in the soil aggregate size fraction was as follows: silt + clay-size fraction > small macroaggregates > fine microaggregates > large macroaggregates. Within a size class, aggregate-associated available and total P contents in the organically amended soil were in the following order: FYM > PS ≥ GM. The available P content of the microaggregates (< 0.25 mm) was 8- to 10-times higher than that of the macroaggregates (> 0.25 mm), and the total P content of the microaggregates was 4- to 5-times higher than that of the macroaggregates. Cultivation without organic amendments resulted in more microaggregates that could be checked by the application of organic amendments such as FYM and GM, which increased the proportion of water-stable macroaggregates by consolidating microaggregates into macroaggregates.

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Effects of Organic Amendments on Soil Physical Attributes and Aggregate-Associated Phosphorus Under Long-Term Rice-Wheat Cropping

Abstract

Soil Till Res

Field Crops Res

Geoderma

Adv Agron

Geoderma

Geoderma

Agric Ecosyst Environ

Soil Biol Biochem

Eur J Agron

Eur J Agron

Soil Till Res

Agric Sci China

Field Crops Res

Fertilizer Recommendation for Principal Crops and Cropping Sequences of West Bengal

Phosphorus: Automated ascorbic acid reduction method. 4500-P F. 4-148-149

Aggregate stability to water

Particulate and mineral-associated organic matter in water-stable aggregates as affected by mineral fertilizer and manure applications

Can J Soil Sci

Reaction of fertilizer and liquid manure phosphorus with soil aggregates and sediment phosphorus enrichment

J Environ Qual

Sorption of carbon and phosphorus from liquid poultry manure by soil aggregates of differing size

Can J Soil Sci

Bulk density

Effects of long term application of inorganic and organic fertilizers on soil organic carbon and physical properties in maizewheat rotation

Agronomy

Management practice effects on phosphorus losses in runoff in corn production systems

J Environ Qual

Pracices in Soil Physics

Ligands and phytase hydrolysis of organic phosphorus in soils amended with dairy manure

Agron J