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Titolo:
Tropical wheat response to irrigation and nitrogen in a Sahelian environment. I. Grain yield, yield components and water use efficiency
Autore:
Pandey, RK; Maranville, JW; Admou, A;
Indirizzi:
Univ Nebraska, Dept Agron, Inst Agr & Nat Resources, Lincoln, NE 68583 USAUniv Nebraska Lincoln NE USA 68583 & Nat Resources, Lincoln, NE 68583 USA
Titolo Testata:
EUROPEAN JOURNAL OF AGRONOMY
fascicolo: 2, volume: 15, anno: 2001,
pagine: 93 - 105
SICI:
1161-0301(200110)15:2<93:TWRTIA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHEASTERN COASTAL-PLAIN; WINTER-WHEAT; DEFICIT; STRESS; GROWTH; CROPS;
Keywords:
fertilizer use; nutrient stress; Triticum aestivum (L.); water stress;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Maranville, JW Univ Nebraska, Dept Agron, Inst Agr & Nat Resources, POB 830915, Lincoln, NE 68583 USA Univ Nebraska POB 830915 Lincoln NE USA 68583 NE 68583 USA
Citazione:
R.K. Pandey et al., "Tropical wheat response to irrigation and nitrogen in a Sahelian environment. I. Grain yield, yield components and water use efficiency", EUR J AGRON, 15(2), 2001, pp. 93-105

Abstract

Every year, increasing areas of irrigated land are being planted to tropical wheat (Triticum aestivum L.) in the Sahel. However, knowledge on how irrigation and nitrogen (N) supply can be simultaneously manipulated to realize maximum yield potential is limited. A 2 year field study was conducted todetermine wheat response to differential seasonal irrigation regimes ranging from 300 to 690 mm applied water and 5 N levels of 0 40, 80, 120 and 160kg N ha(-1). Grain yield and all primary yield components increased linearly in response to irrigation in both seasons. Water use generally increasedlinearly with increased seasonal irrigation and applied N. A quadratic response in grain yield and kernel number m(-2) was observed with increasing Nlevels in all irrigation regimes both seasons. Grain yield, spikes m(-2), kernels spike(-1), number of kernels m(-2) and kernel weight responses to irrigation were greater at the higher N rates. Spikes m(-2) were reduced with water deficit. In both years, the average reduction in number of kernels m(-2) at the maximum irrigation deficit was 40.6 and 45% at 0 and 160 kg N ha(-1), respectively. Similar reduction occurred in kernels(-1) spike, where water deficit decreased this component an average of 21.4 and 31.8% at the lowest and highest N rates, respectively. Water deficit over both years reduced kernel weight by 12 and 19.4% at the lowest and highest N rates. This study showed that optimizing irrigation and N supply in a Sahelian environment can produce economic grain yield, and maximize economic return from wheat production. Nitrogen rate must be matched with the irrigation water available to increase water use efficiency and maximize profits. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 27/01/20 alle ore 07:59:56