Record Details

INTEGRATED NUTRIENT MANAGEMENT EFFECT ON AGGREGATE TURNOVER AND C STABILITY IN A SANDY LOAM SOIL UNDER A RICE-WHEAT CROPPING SYSTEM

KrishiKosh

View Archive Info
 
 
Field Value
 
Title INTEGRATED NUTRIENT MANAGEMENT EFFECT ON AGGREGATE TURNOVER AND C STABILITY IN A SANDY LOAM SOIL UNDER A RICE-WHEAT CROPPING SYSTEM
M Sc
 
Creator BAPPA DAS
 
Contributor Pramila Aggarwal
 
Subject biological phenomena, livestock, yeasts, research methods, fungi, animal husbandry, economic systems, lactation, bacteria, yields
 
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.
 
Date 2016-09-23T16:01:54Z
2016-09-23T16:01:54Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/78628
 
Format application/pdf
 
Publisher IARI, DIVISION OF AGRICULTURAL PHYSICS