Precision nutrient and irrigation management influences the growth, rhizosphere characters and yield of soybean (Glycine max) under system of crop intensification

K S SACHIN; ANCHAL DASS; SHIVA DHAR; G A RAJANNA; TEEKAM SINGH; S SUDHISHRI; H L KUSHWAHA; MANOJ KHANNA

doi:10.56093/ijas.v93i8.136822

Authors

K S SACHIN ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
ANCHAL DASS ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
SHIVA DHAR ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
G A RAJANNA ICAR-Directorate of Groundnut Research, Regional Station, Ananthapur, Andhra Pradesh
TEEKAM SINGH ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
S SUDHISHRI ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
H L KUSHWAHA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India
MANOJ KHANNA ICAR-Indian Agricultural Research Institute, New Delhi 110 012, India

https://doi.org/10.56093/ijas.v93i8.136822

Keywords:

Irrigation, Precision nutrient management, Root-traits, Soybean yield, System of crop intensification (SCI)

Abstract

A field experiment was conducted during rainy (kharif) seasons of 2020 and 2021 at research farm of ICAR-IARI, New Delhi to study the effect of precision nutrient and irrigation management on growth and productivity of soybean [Glycine max (L.) Merr.] under system of crop intensification (SCI). The study was carried out in a split-plot design and replicated thrice. The main-plot included 3 irrigation practices, I₁, [standard flood irrigation at 50% DASM (FI)] and sprinkler (Spr); I₂ (Spr 80% ETc); I₃ (Spr 60% ETc) and sub-plots having 5 precision nutrient management (PNM) practices, viz. PNM₁ [SCI protocol]; PNM₂ [RDF, Basal dose incorporated (50% N, full dose of P and K)]; PNM₃ [RDF, Basal dose point placement (BDP) (50% N, full dose of P and K)]; PNM₄ [75% RDF, BDP (50% N, full dose of P & K)] and PNM₅ [50% RDF, BDP (50% N, full P and K)] and 1 absolute control with conventional practice. Further, for PNM₂-PNM₅ remaining 50% N was supplied through SPAD assisted top-dressing. PNM and irrigation practices improved the plant height and number of branches of soybean. Spr 80% ETc recorded significantly higher crop growth indices, viz. CGR (9.13 g/m²/day), RGR (31.48 mg/g/day), NAR (16.47 mg/cm²/day) and LAI (2.02 cm²/plant) over FI at 60–90 DAS. Root attributes also improved under SCI over control. The mean grain yield was significantly higher in Spr 80% ETc (2.50 tonnes/ha) over FI. Similarly, PNM₃ recorded significantly higher mean grain yield (2.44 tonnes/ha) over PNM₅. Overall, precision nutrition and irrigation enhanced the soybean growth and yield under SCI, hence could be propounded in the soybean growing regions.

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