施氮量和密度对糜子产量的影响

糜子是一种耐旱性作物,增施氮肥是糜子增产的主要方式,且合理密植有利于糜子制造更多的有机质。通过测定糜子净光合速率、蒸腾速率和叶面积等农学参数,研究4个氮肥水平和3个密度处理下对糜子产量的影响,以探索糜子最适播种密度和追施氮肥量。结果表明,密度90万株/hm2在追加纯氮90 kg/hm2时产量达最大值;净光合速率和蒸腾速率都以密度120万株/hm2、追加纯氮90 kg/hm2的处理下呈现最高值。90万株/hm2的种植密度及追施氮肥90 kg/hm2能有效提高糜子的产量。

Influence of Planting Density and Nitrogen Application Rate to Yield in Broomcorn Millet Varieties of Various Ecotypes

Broomcorn millet is a drought tolerance crop and nitrogen application is a primary means to improve the broomcorn millet yield and reasonable planting density is effective for crops to get more organic matter. We contribute to explore the optimum planting density and nitrogen supplement of broomcom millet. By measurings agronomy parametem of broomcorn millet Pn, E and leaf area, we studied the influence of four nitrogen levels and three density treatments on yield and quality. The density of 900 000 plant/hm2 plus pure nitrogen 90 kg/hm2 had the maximum yield; Pn and E with the planting density of 1 200 000 plants/hm2, plus pure nitrogen treatment 90 kg/hm2 showed the highest value; And 900 000 plants/hm2 planting density and pure nitrogen extra 90 kg/hm2 could effectively increase the yield of broomcorn millet as well.