Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Water-yield relations and water-use efficiency of winter wheat in the North China Plain
Autore:
Zhang, H; Wang, X; You, M; Liu, C;
Indirizzi:
Chinese Acad Sci, Inst Agr Modernizat, Shijiazhuang, Peoples R China Chinese Acad Sci Shijiazhuang Peoples R China iazhuang, Peoples R China
Titolo Testata:
IRRIGATION SCIENCE
fascicolo: 1, volume: 19, anno: 1999,
pagine: 37 - 45
SICI:
0342-7188(199910)19:1<37:WRAWEO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDITERRANEAN-TYPE ENVIRONMENT; SOUTHERN HIGH-PLAINS; GROWTH-STAGES; IRRIGATION; EVAPOTRANSPIRATION; CULTIVARS; GRAIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, H Int Ctr Agr Res Dry Areas, POB 5466, Aleppo, Syria Int Ctr Agr Res Dry Areas POB 5466 Aleppo Syria , Aleppo, Syria
Citazione:
H. Zhang et al., "Water-yield relations and water-use efficiency of winter wheat in the North China Plain", IRRIG SCI, 19(1), 1999, pp. 37-45

Abstract

Limited precipitation restricts yield of winter wheat (Triticum aestivum L.) grown in the North China Plain. Water stress effects on yield can be avoided or minimized by application of irrigation. We examined the multi-seasonal irrigation experiments in four locations of the piedmont and lowland inthe region, and developed crop water-stress sensitivity index, relationship between seasonal evapotranspiration (ET) and yield, and crop water production functions. By relating relative yield to relative ET deficit, we foundthat the crop was more sensitive to water stress from stem elongation to heading and fi-om heading to milking. For limited irrigation, irrigation is recommended during the stages sensitive to water stress. Grain yield was 258-322 g m(-2) in the piedmont and 260-280 g m(-2) in the lowland under rainfed conditions. The corresponding seasonal ET was 242-264 mm in the piedmont and 247-281 mm in the lowland. Irrigation significantly increased seasonal ET and therefore grain yield as a result of increased kernel numbers per m(-2) and kernels per ear. On average, one irrigation increased grain yieldby 21-43% and two to four irrigations by 60-100%. Grain yield was linearlyrelated to seasonal ET with a slope of 1.15 kg m(-3) in the lowland and 1.73 kg m(-3) in the pied mont. Water-use efficiency was 0.98-1.22 kg m(-3) :For rainfed wheat and 1.20-1.40 kg m(-3) for the wheat irrigated 2-4 times. Grain yield response to the amount of irrigation (IRR) was developed usinga quadratic function and used to analyze different irrigation scenarios. To achieve the maximum grain yield, IRR was 240 mm in the piedmont and 290 mm in the lowland. When the maximum net profit was achieved, IRR was 195 mm and 250 mm in the piedmont and lowland, respectively. The yield response curve to IRR showed a plateau over a large range of IRR, indicating a great potential in saving IRR while maintaining reasonable high levels of grain yield.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 20:03:31