Cold Rice Yields High Yield Fertilizer Management

In recent years, the production and planting of early-maturing single-season rice in Northeast China has continued to expand. To this end, experts have proposed several suggestions for the management of fertilization in rice production in this year.

During the period of nitrogen fertilizer application, the rice growth period is short. Due to the low temperature, cultivation and management has long been the goal of promoting early delivery and early delivery. In the nitrogen fertilizer application period, the proportion of base fertilizer application is particularly emphasized, and the application of nitrogen fertilizer is emphasized. In the early stage, and the late investment is too small, which causes the irrational period of nitrogen fertilizer application. In fact, the absorption and accumulation of nitrogen by rice is mainly concentrated in the middle and late stages. The experience of the high-yield areas in recent years has proven that the rice fields that are overgrown with base fertilizers have not significantly promoted early-onset high-yield delivery. Instead, they have finally emerged as low-yielding results. This is due to the fact that there is less dry matter in the middle period and there is not a lot of supply. The demand for tillering becomes invalid and the rate of spike formation is reduced. In addition, too much early delivery, nutrients in the middle and late can not keep up, often resulting in small head, because the spike rate is low and not a big head, therefore, the high yield adverse. In response to the current tendency of too little investment in the later period, the adjustment of nitrogen fertilizer shift is proposed. It is recommended that the distribution ratio of nitrogen fertilizer application period is: base fertilizer: lotus root fertilizer: panicle fertilizer = 4:3:3.

Grasping the Appropriate Range of Total Nitrogen Application At present, the total amount of nitrogen applied in production is greatly changed. The survey found that the amount of nitrogen applied varied from 48 to 209 N kg/ha. In recent years, experimental studies have shown that nitrogen application rates of about 100 to 120 kg/ha can satisfy the nitrogen demand of rice in cold regions. In fact, some farmers' habitual application rates have to be increased by 50-65N kg/ha, but field tests show that the increase in nitrogen use does not show an increase in production. However, due to improper application of other techniques such as fertilization, the loss of nitrogen in paddy fields increased.

The depth of the application of nitrogen fertilizer is a key test. It is proved that deep application is the most effective way to reduce nitrogen loss and increase the nitrogen fertilizer utilization rate. The difference in nitrogen fertilizer application and deep application can cause a difference of 50% in the utilization of nitrogen fertilizer. In the cold paddy rice production, it is worth noting that there is a period of time between the application of basal fertilization in paddy fields and the transplanting of rice plants, which is about 20 days. Due to the large amount of basal fertilizer, if it is not applied deeply, the nitrogen loss caused by ammonia volatilization is serious. Therefore, we must adhere to the key technology of deep nitrogen fertilizer application.

Increased Potassium Fertilizer Application Soil tests have shown that the content of available potassium in most paddy fields in the region is at a medium or low level, but long-term application of phosphate fertilizer and nitrogen fertilizer is more, and the application amount of potassium fertilizer is insufficient. It should be noted that the application of potash fertilizer increases the balance between supply of nitrogen, potassium, and phosphorus and potassium, which is beneficial to the high yield and high efficiency of rice.

Pay attention to the long paddy field leisure time in this area, but the water management, long-term flooding but do not pay attention to the sun, in fact, the sun can obtain a good number of good effects, but is conducive to high yield and high efficiency of rice.

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