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Assessment of the nitrogen management strategy using an optical sensor for irrigated wheat

By: Bijay-Singh.
Contributor(s): Chandna, P [coaut.] | Choudhary, O.P [coaut.] | Gupta, R.K [coaut.] | Gupta, R.K [coaut.] | Jagmohan-Singh [coaut.] | Jaspreet-Kaur [coaut.] | Khurana, H.S [coaut.] | Kumar, A [coaut.] | Martin, K.L [coaut.] | Raun, W.R [coaut.] | Thind, H.S [coaut.] | Uppal, H.S [coaut.] | Uppal, R.K [coaut.] | Varinderpal-Singh [coaut.] | Vashistha, M [coaut.] | Yadvinder-Singh [coaut.] | Sharma, R.K [coaut.] | Jat, M.L [coaut.].
Material type: materialTypeLabelArticlePublisher: 2011ISSN: 1773-0155 (Revista en electrónico); 1774-0746.Subject(s): GreenSeeker optical sensor | Indo-Gangetic Plain | Irrigated wheat | Nitrogen management | Potential yield | Response index In: Agronomy for Sustainable Development v. 31, no. 3, p. 589-603Summary: Blanket fertilizer nitrogen (N) recommendations for large irrigated wheat tracts lead to low N-use efficiency due to field-to-field variability in soil N supply and seasonal variability in yield. To achieve high N use efficiency, a site-specific N management strategy using GreenSeeker? optical sensor was evaluated. We conducted seven field experiments during 2004?2006 at three locations to define relationships between in-season sensor measurements and yield of wheat and to know whether response of wheat to fertilizer N can be estimated by sensor measurements. During 2005?2007, four field experiments were conducted to assess the sensor-based N management strategy and to work out prescriptive N management to be followed prior to applying sensor-guided fertilizer dose. We observed robust relationships between in-season sensor-based estimates of yield at Feekes 5?6 and 7?8 stages and actual wheat yields. Response of wheat to fertilizer N defined by the sensor was highly correlated with harvest response index. Sensor-guided fertilizer N applications resulted in high yield levels and high N-use efficiency. Application of 90 kg N ha-1 at planting or in two equal doses at planting and crown root initiation stage was the appropriate prescriptive fertilizer N management. This study reveals that high N-use efficiency in irrigated wheat can be achieved by replacing blanket fertilizer recommendation by an optical sensor-based N management strategy consisting of applying moderate amount of fertilizer N at planting and crown root initiation stages and sensor-guided fertilizer N dose at Feekes 5?6 or 7?8 stages of wheat.Collection: CIMMYT Staff Publications Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-6463 (Browse shelf) Available
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=1774-0746

Blanket fertilizer nitrogen (N) recommendations for large irrigated wheat tracts lead to low N-use efficiency due to field-to-field variability in soil N supply and seasonal variability in yield. To achieve high N use efficiency, a site-specific N management strategy using GreenSeeker? optical sensor was evaluated. We conducted seven field experiments during 2004?2006 at three locations to define relationships between in-season sensor measurements and yield of wheat and to know whether response of wheat to fertilizer N can be estimated by sensor measurements. During 2005?2007, four field experiments were conducted to assess the sensor-based N management strategy and to work out prescriptive N management to be followed prior to applying sensor-guided fertilizer dose. We observed robust relationships between in-season sensor-based estimates of yield at Feekes 5?6 and 7?8 stages and actual wheat yields. Response of wheat to fertilizer N defined by the sensor was highly correlated with harvest response index. Sensor-guided fertilizer N applications resulted in high yield levels and high N-use efficiency. Application of 90 kg N ha-1 at planting or in two equal doses at planting and crown root initiation stage was the appropriate prescriptive fertilizer N management. This study reveals that high N-use efficiency in irrigated wheat can be achieved by replacing blanket fertilizer recommendation by an optical sensor-based N management strategy consisting of applying moderate amount of fertilizer N at planting and crown root initiation stages and sensor-guided fertilizer N dose at Feekes 5?6 or 7?8 stages of wheat.

Borlaug Institute for South Asia|Global Wheat Program|Conservation Agriculture Program

English

Lucia Segura

INT3065|INT3064|INT3072|CGUR01

CIMMYT Staff Publications Collection

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