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本文应用~(15)N示踪法研究不同土壤容重对土壤供氮能力及棉花吸氮的影响。阐明了丘陵黄棕壤地区棉花低产的原因是棉田土壤容重过大,使土壤的供氮能力——A_N值显著下降,棉株对氮素养分的吸收量减少,而且延缓了氮素养分由营养器官向生殖器官的转运。降低土壤容重是挖掘丘陵黄棕壤地区棉田增产潜力的有效施施。
In this paper, ~ (15) N tracer method was used to study the effects of different soil bulk density on soil nitrogen supply and cotton nitrogen uptake. The reason for the low yield of cotton in the hilly region of yellow-brown soil is elucidated that the soil bulk density of the cotton field is too large, the nitrogen-supplying capacity of the soil --A_N is significantly decreased, cotton plants reduce the absorption of nitrogen nutrients, and delay the nitrogen nutrient from nutrition Organ to the reproductive organs of the transport. To reduce the bulk density of soil is an effective method to excavate the yield potential of cotton field in the hilly area of yellow-brown soil.