INTEGRATED NUTRIENT MANAGEMENT EFFECT ON AGGREGATE TURNOVER AND C STABILITY IN A SANDY LOAM SOIL UNDER A RICE-WHEAT CROPPING SYSTEM
KrishiKosh
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Title |
INTEGRATED NUTRIENT MANAGEMENT EFFECT ON AGGREGATE TURNOVER AND C STABILITY IN A SANDY LOAM SOIL UNDER A RICE-WHEAT CROPPING SYSTEM
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Creator |
BAPPA DAS
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Contributor |
Pramila Aggarwal
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Subject |
biological phenomena, livestock, yeasts, research methods, fungi, animal husbandry, economic systems, lactation, bacteria, yields
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Description |
T-8613
The present study aims in understanding the impacts of integrated nutrient management practices on the mechanical properties of aggregates and structural stability of a sandy loam soil. Soil samples were collected from a long-term experiment at PDFSR, Modipuram from 0-7.5, 7.5-15 and 15-30 cm layers and tensile strength (TS), aggregate density (agg), moisture retention by aggregates (AMR) at field capacity and wilting point, and water stability of aggregates were monitored. Soil bulk density and water holding capacity was also recorded. The treatments included unfertlization in both rice and wheat (T1) as control; NPK+Zn in rice and NPK in wheat (T2); NPK+Zn+S in rice & NPK in wheat (T3); N(75)PK+25N (FYM) in rice & NPK in wheat (T4); N(75)PK+25N (Sulphitation press mud) in rice & NPK in wheat (T5); N(75)PK+25N (Green gram residue) in rice & NPK in wheat (T6); N(75)PK + 25N (Green gram residue) in rice and N(75)PK+25N (FYM) in wheat (T7); N(75)PK+25N (Crop Residue) in both crops (T8). The TS and agg were lower with organic substitution (P0.25 mm) constituted 58-92% of water-stable aggregates (WSA), although the proportion significantly varied among the treatments and the depths of soil. Treatment T8 had 83-92% water stable macro-aggregates, significantly higher than other aggregates sizes. Aggregation indices showed better structural stability with crop residue and manure application. Long-term (>18 yr) integrated nutrient management with partial 29 substitution of N by organics improved the aggregates properties compared with mineral fertilizer application in rice-wheat rotation. |
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Date |
2016-09-23T16:01:54Z
2016-09-23T16:01:54Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/78628
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Format |
application/pdf
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Publisher |
IARI, DIVISION OF AGRICULTURAL PHYSICS
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