NDLI: Site-Specific Fertilizer Nitrogen Management Using Optical Sensor in Irrigated Wheat in the Northwestern India

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Site-Specific Fertilizer Nitrogen Management Using Optical Sensor in Irrigated Wheat in the Northwestern India

Content Provider	Springer Nature Link
Author	Gupta, R. K. Choudhary, O. P. Vashistha, Monika Kumar, Ajay Thind, H. S.
Copyright Year	2017
Abstract	An optical sensor-based fertilizer nitrogen (N) management strategy that relies on visible and near-infrared spectral response from plant canopies was evaluated for irrigated wheat in the northwestern India. GreenSeeker™ optical sensor-guided fertilizer N dose, computed from an estimate of potential yield and response index, takes into account both the temporal and field-to-field variabilities and is applied only once after measuring in-season spectral response from the crop canopy. Seven field experiments were conducted in four wheat seasons to decide whether to apply the optical sensor-guided fertilizer N dose at 2nd or 3rd irrigation stage and to work out the appropriate N management before applying it. Robust relationships between in-season sensor-based estimates of yield and actual wheat yields were observed both at 2nd (R $^{2}$ = 0.64) and 3rd (R $^{2}$ = 0.86) irrigation stages of the crop. GreenSeeker-based fertilizer N management resulted in high yield levels and high N-use efficiency. Application of 30 kg N ha$^{−1}$ at planting and 45 kg N ha$^{−1}$ at 1st irrigation was found to be the appropriate N management before applying the GreenSeeker-guided dose at 2nd irrigation stage. Grain yields obtained by following sensor-guided N management were at par with those observed with the blanket recommendation of 120 kg N ha$^{−1}$, but with greater recovery efficiency (by 6.7–16.2%) and agronomic efficiency [by 4.7–9.4 kg grain (kg N applied)$^{−1}$]. The major outcome of this study was that applying a moderate amount of fertilizer N at planting and enough fertilizer N to meet the high N demand during the period between crown root initiation stage and maximum tillering stage before applying a sensor-guided fertilizer N dose at 2nd irrigation stage results not only in high yields but also in high fertilizer N-use efficiency in irrigated wheat.
Starting Page	159
Ending Page	168
Page Count	10
File Format	PDF
ISSN	2249720X
Journal	Agricultural Research
Volume Number	6
Issue Number	2
e-ISSN	22497218
Language	English
Publisher	Springer India
Publisher Date	2017-03-25
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Irrigation Optical sensor Biodiversity GreenSeeker Cell Biology Plant Genetics & Genomics Plant Biochemistry Fertilizer nitrogen management Site-specific nitrogen management Yield Prediction Wheat Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Food Science Agronomy and Crop Science

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