水肥耦合效应对木薯产量的影响

Influence of water and fertilizer coupling effect to cassava yield

研究了不同水肥耦合水平对木薯产量与农艺性状的影响,探讨了木薯水肥耦合的作用机理。结果表明,木薯生育期最佳灌水量为3 600 t/hm2,最佳施肥搭配为N 70 kg/hm2、K2O 105 kg/hm2,水肥搭配量过低或过高都会影响产量。适中的水肥耦合条件下木薯表现出来的农艺性状才具有积极作用,水肥耦合能促进木薯块根生长发育和木薯生理代谢,以此提高木薯水分、养分相互利用率。

This experimental investigation studied the influence of different water and fertilizer levels to the cassava＇s output and agronomic trait. And then discussed the effective mechanism of water and fertilizer coupling. The resuh showed that the best irrigation in the growth season of cassava was 3 600 t/hm2, and the best fertilizer collocation was N 70 kg/hm2 and K20 105 kg/hmz, so both the too much low or high level of water and fertilizer collocation will make an negative impact to the yield of cassava. Under the circumstance of moderate water and fertilizer coupling, Only can the agronomic traits which cassava shows can have a positive effect. The water and fertilizer coupling play the the roles of improving the grow of tapioca root and the cassava＇s metabolic physiology, then increase the mutual utilization rate between the cassava＇s moisture and nutrient.