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Rationalization of Nutrient Management Using Site Specific Nutrient Management Approach and Zinc Bio-fortification in Scented Rice (Cv. Pusa Sugandh-3)

KrishiKosh

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Title Rationalization of Nutrient Management Using Site Specific Nutrient Management Approach and Zinc Bio-fortification in Scented Rice (Cv. Pusa Sugandh-3)
 
Creator Lone, Aabid Hussain
 
Contributor Najar, G R
 
Subject Phytic acid,Pusa Sugandh 3, RTNM, SSNM, Zinc bio-fortification
Soil Science
 
Description PhD Thesis submitted to SKUAST Kashmir
Large field to field variability restricts efficient fertilizer management whenbroad based blanket recommendations are used in rice. Hence, the nutrient management for rice requires an approach that enables adjustments in N, P, and K applications to accommodate the site- specific needs of the crop for supplemental nutrients. This study was conducted to develop the field specific fertilizer recommendations for P and K by adopting the nutrient balance with full maintenance approach and to establish and evaluate the threshold leaf colour value to guide in-season need based fertilizer N top dressing in Pusa Sugandh-3. For determining P and K fertilizer requirements, the relationship between grain yield and nutrient accumulation in above ground dry matter (Reciprocal Internal Efficiency) was estimated. RIEP and RIEK respectively came out to be 2.85 kg P and 15.60 kg K per tonne of grain yield. The contribution of P and K from various sources viz. irrigation water, crop residue and organic manure was quantified by the product of their respective amounts on per hectare basis and their average nutrient status. KW, KCR and KOM were equal to 36.75, 9.54 and 41.1 kg K ha-1 and PCR and POM were equal to1.9 and 9 kg P ha-1 respectively. K leaching loss in absence of lysimeter was determined through K budgeting in soil and it came out to be 7.31 kg K ha-1. These values can be used in computer-based decision tools to predict field specific P and K requirements without doing a soil test. To determine threshold leaf colour value; growth parameters, yield parameters, N uptake and various indices of nitrogen use efficiency (NUE) were measured in both years. Almost all the measured parameters in LCC 4 @ 20 kg N ha-1 were significantly higher than remaining LCC and fixed time N management treatments as well as control. Following the principle that threshold value is the one which simultaneously optimizes grain yield and NUE, LCC 4 @ 20 kg N ha-1 was adjudged as the threshold value for real time nitrogen management in Pusa Sugandh-3. In addition to rationalize the nutrient management, another objective of this study was to investigate the effect of method and timing of fertilizer application on zinc biofortification. Grain zinc concentrations were greatly increased by zinc fertilization. Foliar application at milking stage was more effective than soil application while as foliar application at panicle initiation stage didn’t cause any significant increase in grain zinc levels. Highest grain zinc concentrations were obtained when soil application and foliar application at milking stage was combined. Zinc concentration in unhusked grain, brown rice and white rice were closely associated indicating a possible penetration of zinc from the husk into the inner layers of rice endosperm. A significant drop in zinc concentration in nitrogen omission plot suggests that N and Zn interact synergistically with each other inside plant system. Besides increasing grain zinc concentration, zinc bio-availability was also significantly increased by decreasing phytic acid (a classical anti-nutrient present in rice grain) concentration through both soil as well as foliar application at milking stage. However the combination of these two methods was most effective in increasing zinc bio-availability.
SKUAST Kashmir
 
Date 2016-12-21T13:01:46Z
2016-12-21T13:01:46Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/91782
 
Language en
 
Format application/pdf