Characteristics Of Machine-Transplanted Rice Growth And Nitrogen Accumulation

Nitrogen is one of the most important nutrients in rice plants. Nitrogen in plants exist in many kinds of patterns which changes with the change of rice varieties and cultivation measures. Therefore, to study different Nitrogen application rate cultivation ways and different transplanting density of rice plant Nitrogen accumulation among different patterns will help to clarify the physiological basis of Nitrogen accumulation of rice. This article focuses on the change characteristics of rice plant Nitrogen accumulation in different periods and patterns and the relationship between Nitrogen accumulation under different planting way, density and Nitrogen use patterns through field experiment, mechanical transplanting and manual transplanting. The objects of this study are early rice Yongyou 1540 and late Rice Yongyou 6 and this article studies the distribution of Nitrogen between rice plants under different planting densities and Nitrogen application levels in different planting ways by experiments of different Nitrogen application rate cultivation ways and different transplanting density. This article also analyzes the relationship between Nitrogen and Nitrogen utilization allocation, and on this basis to explore how the density of the mechanical transplanting influence the growth of rice and then identify the growth characteristics and appropriate spacing configuration of mechanical transplanting rice. The main findings are as follows:1. The leaves of hand inserted rice grow faster in its early period and slow in its late period. The leaf growth of mechanical transplanting rice in its late period is faster than hand inserted rice which shows that the leaf growth of mechanical transplanting rice is slow at first and fast afterwards. The larger theamount of fertilizer, the greater Leaf Area Index. Moreover, there are relationships between the leaf area index and the size of transplanting density when the Nitrogen application rate is different.2. Rice transplanted in different ways have the fastest tiller speed at 18th-28th day, and peaked at 28th day. Tiller number, speed affected by rainfall and temperature in rice growth is particularly important indicators.The tiller speed of manual transplanting with higher amount of Nitrogen is greater than mechanical transplanting.The tiller reduction of mechanical transplanting is slower than manual transplanting, and mechanical transplanting have more effective tillers and higher effective panicle in the mature period. The height of rice plant grows fastest from jointing stage to heading stage, and the higher nitrogen application rate, the smaller the spacing transplanting density, the higher of rice plant. The height of the rice plant is affected by the level of fertilization and transplanting density.3.There is no significant difference of rice dry matter production capacity and matter accumulation between mechanical transplanting of Nitrogen is of 11kg,15kg and plant spacing of 12cm and mechanical transplanting of plant spacing of 16cm. However, dry matter accumulation is weak in early period, and a stronger dry matter accumulation in late period which reaches a significant level. There is no significant difference between the dry matter accumulation of mechanical transplanting and Nitrogen rate, transplanting density. 4. Nitrogen accumulation is small in early period, and a faster Nitrogen accumulation after jointing. Rice slower growth in the early density size affects its absorption of nitrogen, nitrogen application amount, the relative amount of nitrogen absorption shoot up, the greater the density insertion machine.The higher the amount of nitrogen, the greater Phosphorus and potassium absorption amount. The smaller the density of mechanical transplanting, the higher accumulation of phosphorus and potassium in shoot with a greater Phosphorus and potassium absorption amount than bigger plant spacing rice.5. When the density of mechanical transplanting is small and effective panicles per unit area is large,the larger the plant spacing, the more grains per panicle under the same plant spacing. There is a significant difference of effective panicles per square meter between early and late rice when nitrogen rate and inserted density is different. The more spikes, the greater the panicle and the lower seed rate of the phenomenon,in transplanting density, increased spike per square meter, transplanting density, will reduce the effective panicles, grain weight increase,High yield can be achieved by increasing the spike number and the weight of each spike.6. Effective panicles and yield per acre was positively correlated in the relationship of yield components of different Nitrogen rate, transplanting density, transplanting methods and yield. The correlation coefficient is large and reach a significant level of the highest correlation coefficient. For different transplanting rice population, its effective panicles per acre, the relationship between the correlation coefficient per panicle, seed setting rate, thousand kernel weight and yield is not exactly the same.7. Different nitrogen and transplanting density showed that pure nitrogen is 15 kg/667m2 and machine rice transplantation density is 30 cm* 12 cm;Different nitrogen application and transplanting ways showed that pure nitrogen is 15 kg/667 m2 and hand transplanting is the yongyou 1540 that is the early season rice varieties, late season varieties is the yongyou 6 that has the ideal machine and the way of transplanting density...