Nitrogen fertilizer can increase dry matter, grain production and radiation and water use efficiencies for durum wheat under semi-arid conditions
Nitrogen fertilizer can increase dry matter, grain production and radiation and water use efficiencies for durum wheat under semi-arid conditions
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DOI：
10.1016/s1161-0301(98)00022-7
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发表时间：
1998-07-01
影响因子：
5.2
通讯作者：
Lawlor, DW
中科院分区：
文献类型：
--
作者：
Latiri-Souki, K;Nortcliff, S;Lawlor, DW
分析了突尼斯半干旱地区硬粒小麦(Karim)对氮肥和灌溉的反应。其目的是确定在非灌溉条件下施用氮肥对作物生产的价值，并分析两种土壤类型的反应机制：Cherfech的粘性土和Nabeul的沙土。灌溉显著增加了砂质土壤的地上干物质生产量，但不能增加粘性土壤的干物质生产量。在旱地和灌溉条件下，施氮也大大促进了干物质的生产。干旱条件下的刺激作用大于充分灌溉条件下的刺激作用：分别为37%和27%。多年来，氮素在两种土壤上都取得了积极的效果。这是由于叶面积指数的增加，维持了绿色作物的持续时间。这增加了总干物质，从而提高了辐射和水的利用效率。但氮肥利用率随着施氮量的增加而降低。探讨了半干旱条件下影响硬粒小麦产量和改良硬粒小麦的机理。(C)1998年爱思唯尔科学公司。
Responses of durum wheat (Triticum durum, cultivar Karim) to application of nitrogen fertilizer and irrigation have been analysed in the semi-arid areas of Tunisia. The aim is to establish the value, for crop production, of applying N fertilizer under non-irrigated conditions and analyse the mechanisms of responses in two soil types: a clay soil at Cherfech and a sandy soil at Nabeul. Irrigation increased above-ground dry matter production substantially on the sandy soil but not on the clay soil. Nitrogen application also stimulated dry matter production substantially in nonirrigated (rainfed) as well as irrigated conditions. The stimulation was greater under drought conditions than well-watered conditions: 37% compared to 27%, respectively. Positive effects of N were obtained on both soils over all years. The effect was due to increased LAI, and maintenance of green crop duration. This increased total dry matter, which resulted in improved efficiencies of radiation and water use. However, the nitrogen use efficiency decreased with nitrogen application. The mechanisms of the effects and the impact on durum wheat production and its improvement under semi-arid conditions are considered. (C) 1998 Elsevier Science B.V.