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Precision nitrogen management in irrigated wheat

KrishiKosh

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Title Precision nitrogen management in irrigated wheat
 
Creator Ratanoo, Rekha
 
Contributor Satish Kumar
 
Subject Irrigation, Yields, Grain, Wheats, Crops, Nitrogen, Planting, Fertilizers, Biological development, Developmental stages
 
Description A field experiment entitled “Precision nitrogen management in irrigated wheat” was
conducted during the winter season of 2013-14 at Agronomy Research Farm of Chaudhary Charan
Singh Haryana Agricultural University, Hisar, Haryana. The experiment was laid out in randomized
block design with three replications. There were 12 treatments comprising N application with and
without using GreenSeeker optical sensor. N application without using GreenSeeker consisted of two
treatments having recommended dose (150 kg/ha) in two (75kg/ha each) and three (50 kg/ha each)
equal splits. GreenSeeker guided N application was combined with fixed rate and fixed time N
application (nine treatments) as basal and at 25 DAS with three levels 75, 100, and 125 kg/ha.
GreenSeeker was used with each fixed level of N application at 2
nd
(50 DAS) and/or 3
rd
irrigation (65
DAS). One treatment was control where no fertilizer N was applied.
Growth parameters viz. plant height, dry matter accumulation and crop growth rate increased
with increase in level of fixed rate N application, whereas, within the same level of N application
growth parameters significantly improved in two stage GS guided N application. Yield attributes as
well as yield, improved significantly with increase in level of fixed rate N application. The highest
yield was recorded in treatment having fixed dose of 75 kg N/ha (25 kg/ha as basal + 50 kg/ha at 25
DAS) combined with GS guided N application both at 2
nd
and 3
rd
irrigation stages i.e. 33 kg/ha and 31
kg/ha, respectively; and it was at par with recommended dose of N either in two or three splits and
treatment having fixed dose of N @ 125 kg/ha combined with GS guided N both at 2
nd
and 3
rd
irrigation. Application of recommended dose of N in three splits proved better than two split
application in terms of yield, N-use efficiency and grain quality. The highest N-use efficiency was
recorded in treatment having fixed dose of 75 kg N/ha (25 kg/ha as basal + 50 kg/ha at 25 DAS)
combined with two stage GS guided N application. Nutrient uptake improved with increasing the
number of splits and total N dose. N-use efficiency decreased with increase in level of fixed rate N
application. A saving of 11 kg N/ha was recorded without reducing the yield in treatment having fixed
rate N application @ 75 kg/ha (25 kg/ha as basal + 50 kg/ha at 25 DAS) combined with two stage GS
guided N. This treatment also led to highest B-C ratio closely followed by three split application of
recommended dose.
 
Date 2016-10-07T09:52:12Z
2016-10-07T09:52:12Z
2015
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/80211
 
Language en
 
Format application/pdf
 
Publisher CCSHAU