Deficit irrigation of rapeseed for water-saving: Effects on biomass accumulation, light interception and radiation use efficiency under different N rates
Deficit irrigation of rapeseed for water-saving: Effects on biomass accumulation, light interception and radiation use efficiency under different N rates
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DOI：
10.1016/j.agee.2012.04.003
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发表时间：
2012-07-15
影响因子：
6.6
通讯作者：
Soltani, Jalal
中科院分区：
文献类型：
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作者：
Hamzei, Javad;Soltani, Jalal
油菜是世界上最重要的油料作物之一，其种植潜力很大，特别是在干旱和半干旱地区。油菜籽的管理实践对辐射利用效率(RUE)的影响还没有很好的记录。一般认为，作物地上干物质(ADM)的减少是由于氮素供应不足和灌溉造成的。为了验证这一假设，我们在油菜种子上应用了缺水灌溉技术，并对比了氮素供应。处理包括低氮水平(LN，8gNm(-2))、正常水平(NN，12gNm(-2))和高氮水平(HN，16gNm(-2))，并结合三个灌溉水平(IR1,7500；IR2,4500；IR3,3000m(-1))。测定ADM、籽粒产量(GY)、叶面积指数(LAI)、氮素营养指数(NNI)、叶片叶绿素(SPADI)、捕获率(CR)、渗透率(PR)、反射率(RR)、累积PAR(Sigma IPar)和RUE。方差分析表明，施氮量和灌水量对各性状均有显著影响。IR1和IR2处理的RUE与IR3相当或高于IR3(分别为0.756和0.745，而IR3和IR2的RUE分别为0.477和0.477)。然而，灌溉水平×施氮量的交互作用只影响ADM、GY、Sigma iPar和RUE。这些性状的最大值在IR1×NN、IR1×HN、IR2×NN和IR2×HN组合处理下保持不变。因此，田间条件下油菜可推荐IR2×NN处理，以获得最高产量。(C)2012爱思唯尔B.V.保留所有权利。
Rapeseed is one of the most important oilseed crops worldwide and there is a high potential for expansion of its cultivation, particularly in arid and semi-arid regions. Management practice effects on radiation use efficiency (RUE) have not been well documented for rapeseed. It is thought that reduction of aboveground dry matter (ADM) in crops after decreased RUE occurs due to shortage of nitrogen and irrigation. To test this hypothesis, we applied deficit watering techniques to rapeseed with contrasting nitrogen supply. Treatments included three levels of nitrogen supply, namely low level (LN, 8 g N m(-2)), normal level (NN, 12 g N m(-2)) and high level of nitrogen (HN, 16 g N m(-2)), in combination with three levels of irrigation (IR1, 7500; IR2, 4500; and IR3, 3000 m(3) water ha(-1)). Then, traits of ADM, grain yield (GY), leaf area index (LAI), nitrogen nutrition index (NNI), leaf chlorophyll (SPADi), capture ratio (CR), penetration ratio (PR), reflection ratio (RR), accumulated PAR (Sigma iPAR) and RUE were measured. The ANOVA revealed that the N and irrigation treatments exerted significant effects on all traits. RUE in IR1 and IR2 treatments was comparable to, or higher than, that in IR3 (0.756 and 0.745 vs. 0.477 g mu mol(-1)). However, the interaction of irrigation levels x N rates affected only ADM, GY, Sigma iPAR and RUE. Maximum values of these traits remained unchanged at IR1 x NN, IR1 x HN, IR2 x NN and IR2 x HN combined treatments. In conclusion, the IR2 x NN treatment can be recommended for rapeseed under field conditions in order to maximize the yield. (C) 2012 Elsevier B.V. All rights reserved.