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20171
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Subject: Agronomy × Author: Jashanjot Kaur × End date: 2019 × Start date: 2010 × Type: Thesis × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Precision nutrient management in wheat (Triticum aestivum L.) using Nutrient Expert and GreenSeeker
    (Punjab Agricultural University, Ludhiana, 2017) Jashanjot Kaur; Hari Ram
    The present investigation“Precision nutrient management in wheat (Triticum aestivum L.) using Nutrient Expert and GreenSeeker” was conducted at the Research farm, Wheat Section, Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana during winter (rabi) season of 2014-15 and 2015-16. Experiment I was conducted to assess different precision nutrient management practices in different varieties under different tillage systems. It was laid out in split plot design with three replications, in main plot there was combination of two tillage systems (conventional and zero tillage) and two varieties (WH 1105 and HD 2967). In sub plot there were six nutrient management practices (No N control, Nutrient Expert for Wheat, 70% N, full P, K with Nutrient Expert for Wheat + remaining N as guided by GreenSeeker, N120 before irrigations,N120 after irrigations and N Rich (N180)). Experiment II was conducted in Randomized block design with 15 treatments [Control (No nitrogen), N120, N150, N180, N60 or N84 or N120 + remaining or additional N as guided by GreenSeeker [Feekes stage 5-6 (second irrigation)] or [Feekes stage 7-8 (third irrigation)], 50% N or 70% N through Nutrient Expert (NE) + remaining N as guided by GreenSeeker [Feekes stage 5-6 (second irrigation)] or [Feekes stage 7-8 (third irrigation)] and complete N through NE] with three replications. Similar growth characters, grain yield, quality characters, phenology and nutrient content of wheat were recorded under CT and ZT options. ZT recorded 8.4 per cent higher net returns than CT. Wheat variety HD 2967 recorded better growth characters than variety WH 1105. However, variety WH 1105 recorded 1.87 per cent higher grain yield than variety HD 2967. No varietal difference was recorded in quality characters, phenology, nutrient content and economics. Application of 160-164 kg N ha-1 in three splits (60 kg N at sowing + 60 kg N at first irrigation + 44/40 kg N at second irrigation guided by Green Seeker) or application of 172/169 kg N ha-1 in in three splits (60 kg N at sowing + 60 kg N at first irrigation + 52/49 kg N at second irrigation) with Nutrient Expert and GreenSeeker at 2nd irrigation (120+52/49) recorded better growth characters as well as higher NDVI thus contributing to better wheat yield and quality than blanket application of 120 kg N/ha but similar to blanket application of 150 kg N/ha in different varieties and tillage options. Delayed application of 126/131 kg N ha-1 in four splits (40 kg N at sowing + 40 kg N at first irrigation + 40 kg N at second irrigation + 6/13 kg N at third irrigation guided by Green Seeker) or application of 129/142 N kg ha-1 (40 kg N at sowing + 40 kg N at first irrigation + 40 kg N at second irrigation + 9/22 kg N at third irrigation guided by Green Seeker) with combination of Nutrient Expert and GreenSeeker at 3rd irrigation (120+9/22) gave higher returns with N saving of 9-24 kg/ha and higher yield as well as net returns in comparison to 150 kg N/ha.