Effect of Nitrogen Fertilizer on the Accumulation and Distribution of Dry Matter in Broomcorn Millet

摘要

Objective] To understand the effect of nitrogen application on dry matter accumulation and al ocation dynamics in broomcorn mil et. [Method] The accumula-tion and distribution of dry matter were studied using cultivars Jin Shu 7 and Huang Mizi at different levels of nitrogen fertilizer at the jointing stage. [Result] The results showed that increasing N application led to the increase of green leaf area and the delay of leaf senescence, which was beneficial to the accumulation of dry matter. Appropriate nitrogen application (90 kg/hm2) could coordinate the translocation rate of dry matter among different plant parts, thereby enhancing the yield of broomcorn mil et; among different organs, the contribution rate of stem to kernel was greater than that of leaf to kernel; there was obvious correlation between dry matter and yield. For Jin Shu 7, leaf area and dry weight of spike showed significant negative correlation with yield. [Conclusion] The formation of grain yield of broomcorn mil et involved the accumulation and al ocation of dry matter, the appropriate amount of nitrogen application (90 kg/hm2) could improve the rates of translocation and contri-bution of dry matter, thereby promoting the yield of broomcorn mil et.