Long term impact of STCR approach for nutrient management on P and K dynamics in pearl millet-wheat cropping system
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Date
2019
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CCSHAU
Abstract
The present study was carried out on the ongoing long term experiment of STCR initiated
originally in 2009 at Research Farm of Department of Soil Science, CCS, HAU, Hisar. The experiment
was planned in a randomized block design with four replication and seven treatments viz. T1-control,
T2- FYM @ 15 t ha-1, T3-RDN & P, T4-STCR with TY 5.5 t ha-1, T5-STCR with TY 6.0 t ha-1, T6-
STCR-IPNS with TY 5.5 FYM and T7-STCR-IPNS with 6.0 FYM yield targets. FYM @ 15 t ha-1
were applied in rabi and kharif season in T2, T6 & T7 plots. Grain yield of wheat was significantly
affected by integrated use of fertilizers with FYM after nine cycles of pearl millet-wheat cropping
sequence. FYM with NP fertilizers recorded the highest wheat grain and straw yield (6215 & 9295 kg
ha-1) followed by NP fertilizers and lowest in control (1585 & 2880 kg ha-1). The per cent deviations of
grain yield in target yield treatments with and without FYM vary from -0.7 to +3.6. Application of
FYM along with NP fertilizers enhanced total N, P and K uptake to the tune of 160.6, 30.2 and 159.0
kg ha-1. Amongst the different treatments, highest inorganic P fractions were observed under the
treatment consisted of FYM in combination with NP fertilizers followed by the NP fertilizers
treatments and control.. The effect of FYM in combination with NP fertilizers was found to be more
pronounced in increasing all the inorganic K fractions. The available N, P and K increased significantly
among different treatments and were recorded highest (142.25, 31.69 & 485 kg ha-1 and 96.75, 19.76 &
262.5 kg ha-1) and lowest in control both at surface and subsurface soil, respectively. The soil
properties soil organic carbon, EC and micronutrients increased significantly with application of FYM
alone or in combination with NP fertilizers. A decrease in soil pH was observed in the treatments
where FYM alone or in combination with NP fertilizers were applied. The build-up of P fractions
i.e.,Sa-P (5.90 to 14.57 mg kg-1), Al-P (60.59 to 109.43 mg kg-1 ), Fe-P (26.53 to 45.06 mg kg-1), Ca-P
(124 to 133.64 mg kg-1) and Total-P (271.25 to 353.98 mg kg-1) were higher in surface (0-15 cm) soil
as compared to sub-surface (15-30 cm) soil. The K fractions i.e., Water soluble and exchangeable K
were found to be decreased with increased soil depth whereas, non-exchangeable, lattice and total-K
show reverse. The highest value of water soluble K (25.22 & 18.48 mg kg-1 ), exchangeable-K (199.90
& 113.56 mg kg-1), non-exchangeable-K (1991 & 2088 mg kg-1 ), lattice-K (553 & 558 mg kg-1) and
total-K (2745 & 2759) were found in treatments where FYM alone or in combination with NP
fertilizers were applied at both surface and sub surface soil depth, respectively, followed by NP
fertilizers treatment and control.The relative abundance of inorganic P and K fractions was in the order
of Saloid-P < Fe-P < Al-P < Ca-P < total-P and water soluble-K < exchangeable-K < non
exchangeable-K< total-K.
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