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In terms of crop growth, as the temperature turns cold, it is said that "the autumn is not cool, the seeds are not yellow". A variety of spring crops will enter the maturity stage, which is good for the night after the summer, and the crops absorb nutrients during the day for photosynthesis products to be stored at night, which is conducive to the maturity of the crops. Therefore, there are popular farms in the country, such as “Summer Hetian, Evening Changeâ€, “Healing the Tiantian Huang, and Repairing the Warehouseâ€. As far as rice production is concerned, early rice is about to be harvested at the time of summer, mainly because late rice is in an important period of field management and fertilization.
Late rice production has two seasons of late rice and single season of late rice. The growth period and nutrient requirements of these two late rice varieties are different, so their fertilization, especially the application period of nitrogen fertilizer, is obviously different, according to the two types of late rice. Fertilization regulation separately:
Double-season late rice (post-season rice) fertilization double-season late rice has a short growth period, and it begins to differentiate into ears during tillering, and enters the tillering stage in panicle differentiation. There is an obvious absorption peak in one life, that is, after transplanting. The peak of absorption is formed in 2 to 3 weeks, which is earlier than the absorption peak of single-season late rice, and it is also overlapping type. Because the water temperature and soil temperature in the early stage of late rice are not conducive to the absorption of roots, it is necessary to pay attention to the increase of panicle fertilizer in the double-season late rice, and in the panicle differentiation-meiosis phase. However, in the middle and lower reaches of the Yangtze River, the application of nitrogen fertilizer during flowering should be controlled in several stages. Because the temperature drops rapidly in the later period, excessive nitrogen fertilizer will cause rice to be greedy, delaying maturity and reducing production, and will also increase the occurrence of pests and diseases. According to the above characteristics, the base fertilizer and top dressing are applied in the double-season late rice fertilization technology, and the appropriate amount of topdressing is applied in the panicle differentiation stage. Under the condition of ensuring safe and uniform ear, it is expected that the seedling fertilizer will be applied in the later stage.
Single season late rice fertilization single season late rice has a longer growth period, generally 100 to 130 days in the growth period of the field. The vegetative growth and reproductive growth of single-season late rice are isolated. This type of late rice has two peak periods of fat absorption, one in the tillering stage and the other in the panicle differentiation stage, and the later stage of the fertilizer absorption peak is higher than the previous stage. This indicates that the panicle fertilizer of single-season late rice is more important. In the different cultivation methods of late rice transplanting and transplanting, the suitable ratio of nitrogen fertilizer applied is 40%-50%, which can maintain high tillering rate and the development of the population is reasonable, which is beneficial to increase the photosynthetic material after heading. Accumulation and operation, obtain the appropriate number of kernels and 1000-grain weight. The total nitrogen content of the fake facilities is 12~14kg/mu, and the nitrogen application rate of the throwing cultivation is: base fertilizer: manure: panicle fertilizer=40%: 30%: 30%, the ratio of transplanting nitrogen fertilizer is: base fertilizer: manure : Panicle fertilizer = 50%: 30%: 20%.
In conclusion, the double-season late rice and the single-season late rice have different nitrogen fertilizer application periods. The principle of the former is: appropriate re-application of tiller fertilizer, reflecting the principle of pre-promotion, central control, and post-insurance; but the former promotion can not cause excessive consequences of excessive seedlings and ineffective division. The latter should reflect the principles of pre-stable, mid-attack and post-complement; appropriate control in the early stage, focusing on the big spike, and topdressing can be divided into 2 or 3 times.
In addition, late rice fields are prone to potassium deficiency in early rice fields. Potassium fertilizer application in late rice is important for growth of seedlings and later resistance to rice blast, and is also beneficial to increase the number of panicles, grain number per ear and yield. The amount of potassium applied per mu is preferably 4 to 6 kg. The application period can be used as a base fertilizer, or 50% as a base fertilizer and 50% as a panicle fertilizer.
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At the end of the summer, the rice was fertilized at the time.
On August 23, I entered the summer solar terms, and the "Zhou" had the meaning of termination. Therefore, the arrival of "Study of Summer" indicates that the hot summer day is about to end. The heat is a turning point in the decline of high temperatures, indicating that the climate is getting colder. In many places in China, the summer heat means the beginning of the cool autumn, but in some places there will be a brief high temperature of the "autumn tiger".
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