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Experts believe that there are three aspects worthy of improvement in this case: 1. There is a problem between the production level of the early rice and the nitrogen input, and the nitrogen fertilizer efficiency needs to be improved. According to the output of 325 kg, the total nitrogen application should be 8 - 10 kg / acre, 10 kg of thin ground, 8 kg of fertilizer can be.
2. In terms of the proportion of base topdressing and the application period of top dressing, the base fertilizer should be applied first, and it is best to combine organic fertilizer with chemical fertilizer. All the phosphate fertilizer, part of the potassium fertilizer and 60% of the nitrogen fertilizer were applied to the soil as the base fertilizer before the transplanting, and the phosphate fertilizer was used as the base fertilizer, which was applied in two layers at one time. Half of the potash is used as the base fertilizer, and the other half is used as the top dressing. Generally, the early rice topdressing is best divided into 2 times. The first time the manure can be applied in a small amount, accounting for 10%-15% of the total amount; the second top dressing is generally after the termination period of the effective tillering. The amount of nitrogen fertilizer applied is generally 20% of the total amount. It is difficult to separate the early rice topdressing and push it after appropriate time. The period is short and the change is fast. If you pay little attention, it will cause late lodging, pests and diseases or 1000-grain weight drop, and the seed setting rate will affect the yield. However, if the excessive application of nitrogen fertilizer is too early, lodging may still occur. Only the combination of nitrogen, phosphorus and potassium fertilizers, and the appropriate amount of nitrogen fertilizer can avoid this danger. In recent years, the soil fertility of paddy fields has gradually increased. Under the condition of ensuring the total number of stems in the farmland, the nitrogen fertilizer has a lower risk of high yield.
3. In the selection of nitrogen fertilizer varieties, it is recommended to use ammonium bicarbonate instead of urea. Ammonium bicarbonate is not only effective, but also economical and reasonable. In the application method, nitrogen fertilizer must be applied to the soil and not applied to the water surface. In the selection of elemental phosphate fertilizer varieties, it is recommended to apply calcium magnesium phosphate fertilizer, which is economical and reasonable.
Senior Consultant of Sinochem Fertilizer Co., Ltd., Professor of China Agricultural University Cao Yiping
Economic and technological choices for early rice fertilization
The average production of early rice planted by Zhang Zhuqing, a farmer in Hubei Province, was 325 kg/mu in 2007. At that time, he set a target of 400 kg. The fertilizer invested was converted into a nutrient component of 12 kg per mu, 4 kg of phosphorus, and potassium 3.5. kg. The fertilizer he actually uses is urea and high-tower compound fertilizer (22-8-7). How do you improve the yield of early rice? In the current fertilizer market, the general price increase of fertilizer, what fertilizer should I buy this year? How much fertilizer is used? How to cast? Lao Zhang then went to the expert consultation through the 8008109991 consultation call.
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