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以“蒙农4号”新麦草为试材,采用不同追肥时期(果后营养期、返青期、孕穗期,处理代号记为T1、T2、T3),不同追肥量(33.3、66.7、100.0、133.3、166.7g·m-2,处理代号记为N1、N2、N3、N4、N5)对“蒙农4号”新麦草进行田间试验,研究了磷酸二铵对“蒙农4号”新麦草种子产量及其构成因子的影响,以期为生产实践提供理论依据。结果表明:追施磷酸二铵可以明显提高6年生“蒙农4号”新麦草种子产量,以果后营养期追施166.7g·m-2的效果最佳,种子产量达到最大值为1 546.44kg·hm-2,比对照提高了355%。影响“蒙农4号”新麦草种子产量的主要因子是生殖枝数;小穗数、千粒质量、每小穗小花数和每小穗种子数对种子产量影响较弱。
The experiment was conducted with different wheat varieties (“Mengnong No.4” and “Xinnong 4”) with different topdressing dates (nutrition period, returning green stage and booting stage, treatment code T1, T2 and T3) 100.0, 133.3 and 166.7g · m-2, and the treatment codes were N1, N2, N3, N4 and N5). The effects of diammonium phosphate on the growth of “Mengnong 4” 4 “new wheatgrass seed yield and its composition factor, in order to provide a theoretical basis for production practice. The results showed that topdressing ammonium dihydrogen phosphate could significantly increase the seed yield of 6-year-old ”Mengnong 4" new wheatgrass, and the effect of topdressing 166.7g · m-2 after the nutritional period was the best, the seed yield reached the maximum 1 546.44kg · hm-2, 355% more than the control. The main factors influencing the seed yield of P. annua 4 were the number of reproductive branches; the number of spikelets, the mass of 1000 grains, the number of florets per spike and the number of seeds per spike had little effect on seed yield.