Response of Specific Leaf Area (SLA), Leaf Area Index (LAI) and Leaf Area Ratio (LAR) of Maize (Zea mays L.) To Plant Density, Rate and Timing of Nitrogen Application
Response of Specific Leaf Area (SLA), Leaf Area Index (LAI) and Leaf Area Ratio (LAR) of Maize (Zea mays L.) To Plant Density, Rate and Timing of Nitrogen Application
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发表时间：
2007
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通讯作者：
M. J. Hassan;K. Nawab;Asad Ali
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作者：
M. J. Hassan;K. Nawab;Asad Ali
3摘要：氮素被认为是提高大田作物产量所需的最重要的投入之一。根据玉米需要适时平衡施氮，减少氮素损失，提高产量和品质。还需要了解施氮水平和施氮时间对玉米生理的影响，试图探索进一步的途径，进行适当的养分管理，以持续提高产量。因此，试验设计和种植在西北边境省农业大学，白沙瓦的农业研究农场连续两年（2002年夏季和2003年夏季）的目的是研究种植密度，氮水平和时间对SLA，LAI和LAR的玉米。随着密度、施氮量和劈裂数的增加，叶片比叶面积、叶面积指数和叶面积比均达到最大值。SLA、LAI和LAR分别以0.152cm/g、0.0065和21
3 Abstract: Nitrogen is considered as one of the most important inputs needed for increasing productivity of field crops. Balanced amount of N application at proper time according to the need of the maize decreases N losses, increases yield and quality. There is also a need to understand how levels and timing of N application affect the physiology of maize is an attempt to explore further avenues for proper nutrient management for improving yield on sustainable basis. Thus the experiment was designed and planted at the Agriculture Research Farm of the NWFP Agricultural University, Peshawar for two consecutive years (summer 2002 and summer 2003) with a an objective to study the effect of plant density, N rates and timing on SLA, LAI and LAR of maize. All the three parameters i.e. SLA, LAI and LAR enhanced to a maximum with increasing plant density, N rate and number of splits for N application. SLA, LAI and LAR enhanced at the rate of 0.152 cm g , 0.0065 and 21