N Application And Planting Density On The Effects Of Cropping Yield And Nitrogen Utilization

In this paper,using split plot experiment design, the five kinds of N application and three planting density conditions, to study the different nitrogen (N) quantity and planting density treatment of xiangbei cropping yield, yield components, agronomic traits and nutrient absorption characteristics and the influence of the utilization efficiency of nitrogen fertilizer. Five kinds of application rate of early rice respectively0,60,120,180,240kg/hm2; Late rice respectively0,50,100,150,200kg/hm2. Three planting density of rice360000holes/hm2respectively (16.6cm×16.6cm),300000holes/hm2(16.6cm×20.0cm),240000holes/hm2(16.6cm×25.0cm). Late rice respectively300000holes/hm2(16.6cm×20.0cm),240000holes/hm2(16.6cm×25.0cm),180000holes/hm2(16.6cm×33.3cm). Test results are as follows:1. The determination results of cropping agronomic traits showed that N fertilizer and planting density on cropping plant height, tiller number, leaf area index, dry matter accumulation amount have significant impact. The same planting density conditions, the above indexes increases with the increase of N fertilizer, but growth owing to the different density. The high density of low density its growth rate is high, its growth is small. The same conditions of N fertilizer, tiller number, leaf area index, dry matter accumulation quantity are increased with the increase of planting density increased. The test processing, plant height, tiller number, leaf area index, dry matter accumulation quantity index of agronomic traits, early and late rice respectively by the highest N180D36, N200D30processing.2. Cropping leaf chlorophyll content determination results showed that:the same planting density conditions, cropping the growth of leaf SPAD values are increased with the increase of N content increased; The same conditions of N fertilizer, all increases with the increase of planting density.3. The determination of nutrient uptake cropping results show that the same planting density conditions, cropping of N, P, K uptake increases with the increase of N fertilizer; Under the condition of same N content, N, P uptake increased with the increase of planting density increased, while K uptake as the change of planting density is smaller.4. The determination of cropping yield results show that the same planting density conditions, cropping yield increases with the increase of N fertilizer, but high density under the condition of its growth rate is less than low density conditions; Production with the change of density is low under the condition of applied N level as the density increases, under the condition of high N level with the increase of density. The test processing, early and late rice respectively at N180D36, N200D30treatment has the highest yield.5. Cropping yield components of the determination results show that the same planting density under the condition of effective ear Numbers per spike, grain number per panicle, are increased with the increase of N content increased, but the grain the differences between the groups was not significant; Under the condition of same N content, effective panicle number and grain number per panicle increased with the increase of planting density increase; Grains decreases with the increase of planting density. In this experimental treatment, early and late rice respectively with N180D36, N200D30processing most effective panicle number and grain number per panicle.6. Comprehensive cropping grain yield and its component, nutrient uptake, and the performance of the agronomic traits, in this test set within the scope of the processing of early rice to N180D36processing, late rice N200D30processing as the appropriate amount of nitrogen and planting density.