关键词: 沙柳木蠹蛾, 沙柳木蠹蛾, 幼虫, 危害特性, 空间格局, 地统计学

Abstract: The experiment aimed to find the best application period and the best allocation proportion of potassium fertilizer for the super high yield maize and provide theoretical basis and technical support for the efficient application of the super high yield maize potassium fertilizer in the east of Jilin province. This study was to investigate the different application method and allocation proportion of potash fertilizer impact on the maize yield, potassium uptake and accumulation, potassium absorption and utilization efficiency under the same conditions of K, P and K for the field test method. The results was indicative of the yield of maize reached the level of difference between each treatment in the eastern part of Jilin province. The yield of the most productive treatment was 15535.6 kg/hm2. The yield of 3 treatments increased by more than 30% compared with no potassium treatment, which reached the level of super high yield. The accumulation of dry matter increased linearly while the potassium accumulation first increased and then decreased and reached the peak at the grain filling stage. During the accumulation of dry matter in the late growth stage of maize, the potassium is not stored in the plant, but gradually with prolonged leaching. The utilization rate of potassium, potassium uptake efficiency and partial productivity of potassium of the best production treatment was 66.9%, 1.7 kg/kg and 111.0 kg/kg, the each index was higher than other experimental treatments. It was showed that the proper potassium application could effectively improve the potassium uptake and accumulation of vegetative organs at different stages of plant, and the ratio of potassium in the vegetative organs of the later stage of the growth of the growth of the late growth stage was the best in order to obtain a higher utilization rate of potassium, potassium uptake efficiency and partial productivity of potassium. The best way of applying potassium fertilizer for super high yield maize province under certain conditions of N, P and K in eastern Jilin province: 75% of the potash is the base fertilizer, 25% of the potash is the after manuring (N 300 kg/hm2、P2O5 140 kg/hm2和K2O 140 kg/hm2), at this time can be achieved the highest yield and potassium utilization efficiency.