猪肉可持续供应链建设的构想与实现途径

不同密度和化控制对玉米农艺性状及产量的影响试验结果表明,品种、化控剂和种植密度均对产量及农艺性状具有较大的影响,但三者之间互作相关性不显著.在使用化控剂处理条件下,玉米产量随着种植密度的增加表现为逐渐增加而后降低的趋势;不同化控剂在一定程度上提高了百粒重,且随着密度增加百粒重变化幅度很小.不同化控剂处理均显著降低了玉米株高和穗位,降低了植株倒伏率.适宜高密度和化控剂可协同提高玉米籽粒产量,表明化控剂在一定程度上降低了高密度条件对玉米倒伏率的影响;同时施用玉喜化控剂对作物的株高、穗位有更佳的调控效果,可以有效降低倒伏率.

Effects of planting density and chemical control agentson agronomic traits and yield of maize

Completely randomized block design was applied in the experiment, two maize varieties Guidan 0810, P619 were used as test materials, maize yield and its component factors were investigated and measured under the combinations of different planting densities (45000, 52500, 60000, 67500 plants/hm2) and two chemical control agents (Qixiannv, Yuxi, water as the CK). The results showed that variety, chemical control and planting density all had significant effects on yield and agronomic traits, but the interaction among the three factors was not significant. The yield of maize increased and then decreased with the increase of planting density in the application of chemical control agents. Chemical control agent in a certain extent improved the 100-grain weight, and the 100-grain weight showed a little variation with the increase of planting density. Different chemical control treatments significantly reduced the plant height and spike height, and decreased the plant lodging rate. Therefore, suitable high density cooperated with chemical control agent was the preferred way to get high maize yield. Chemical control agent in a certain extent reduced the effect of high density on lodging rate of maize. Application of chemical control agent could significantly reduce the plant height, spike height, increase stem diameter and the 100-grain weight, and Yuxi had a significant regulatory role in the plant height and ear height, and effectively reduced the lodging rate.