叶片的光合生产能力直接受光照强度的制约，同时还受气温和空气相对湿度的影响。
Photosynthetic productivity of the leaves is affected by temperature and relative humidity of air as well as directly constrained by intensity of the sunlight.
氮肥是决定玉米光合物质生产能力的关键因素之一。
Nitrogen is one of the most important decisions of photosynthetic material production capacity of maize.
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