Precision nitrogen management in irrigated wheat
KrishiKosh
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Title |
Precision nitrogen management in irrigated wheat
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Creator |
Ratanoo, Rekha
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Contributor |
Satish Kumar
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Subject |
Irrigation, Yields, Grain, Wheats, Crops, Nitrogen, Planting, Fertilizers, Biological development, Developmental stages
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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. |
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Date |
2016-10-07T09:52:12Z
2016-10-07T09:52:12Z 2015 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/80211
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Language |
en
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Format |
application/pdf
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Publisher |
CCSHAU
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