关键词: 旱薄地, 夏播谷子, 氮肥, 合理施用量

Abstract:

The effects of nitrogen fertilizer on yield and lodging of foxtail millet in dry and thin land were studied. The split-plot design method was used to design different nitrogen application rates, with N application rate as the main area, and foxtail millet varieties with different lodging resistance as the sub-area. The amount of P and K fertilizer were the same for all treatments. Different amounts of nitrogen fertilizer were designed and applied to the soil according to the 7:3 ratio of base fertilizer at the sowing stage and topdressing at the jointing stage. The effects of nitrogen fertilizer on the morphological traits, economic traits, nitrogen uptake per 100 kg grain, nitrogen utilization rate and lodging degree of millet crop at different growth stages were discussed. According to the findings, the highest millet yield and the strongest lodging resistance were observed under N2 (180 kg/ha) treatment. With the increase of nitrogen fertilizer, the yield of foxtail millet changed from low production type to medium production or high production type. In order to achieve the corresponding target yield of different foxtail millet varieties, the nitrogen uptake of 100 kg grain was different, and the nitrogen uptake of 100 kg grain of high yield type was about 3.36 kg. The nitrogen application rate of 180 kg/ha was more appropriate for foxtail millet in dry and thin land based on the morphological characteristics, yield, and lodging resistance of the plant at various growth stages. Canggu 6 not only had high and stable yield, but also was a foxtail millet variety resistant to low nitrogen stress.

Key words: Dry and thin land, Summer-sown foxtail millet, Nitrogen fertilizer, Reasonable application rate