Effects of gibberellic acid spray on nitrogen yield efficiency of mustard grown with different nitrogen levels
Effects of gibberellic acid spray on nitrogen yield efficiency of mustard grown with different nitrogen levels
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DOI：
10.1023/a:1021523707239
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发表时间：
2002-11-01
影响因子：
4.2
通讯作者：
Samiullah
中科院分区：
文献类型：
--
作者：
Khan, NA;Mir, R;Samiullah
芥末在世界各地种植，以获取其种子中的油。它需要高氮投入以提高生产力，但由于各种限制，施入土壤的氮不能被作物充分利用。研究的目的是确定叶面喷施赤霉酸（GA（3））是否能促进作物生长和提高氮素利用率。在1997-98年进行的田间试验中，在播种后40天（开花前）对种植有0、40（次优）、80（优）和120（超优）kg Nha（-1）的芥菜进行叶面喷施GA（3）（10（-5）M）。叶面喷施GA（3）仅在植株接受足够的N（80 kg N ha（-1））时有效。喷施GA（3）显著提高了植株干重、叶面积、CO2交换速率、植株生长速率、作物生长速率和相对生长速率。GA（3）处理的植株通过将氮重新分配到种子中而表现出提高的氮利用效率。
Mustard is cultivated throughout the world for oil in its seeds. It requires high nitrogen input for improved productivity but the nitrogen applied to the soil is not fully utilised by the crops due to various constraints. The objective of the reported research was to determine if foliar- applied gibberellic acid (GA(3)) could enhance crop growth and increase nitrogen-use efficiency. A field experiment was conducted during 1997-98 in which GA(3) (10(-5) M) was applied to foliage at 40d after sowing (pre-flowering) to mustard grown with 0, 40 (sub-optimal), 80 (optimal) and 120 (supra-optimal) kg N ha(-1). Foliar spray of GA(3) was effective only when plants received sufficient N (80 kg N ha(-1)). GA(3) sprays significantly enhanced plant dry mass, leaf area, carbon dioxide exchange rate, plant growth rate, crop growth rate and relative growth rate. GA(3)-treated plants showed enhanced nitrogen-use efficiency through redistribution of N to seeds.