After entering the cold winter season, the temperature is even lower, and the weather turns from cold to cool. The vast areas of the south will enter the autumn and the autumn will gradually increase. The northeast and northwest will present a deep autumn scene or will soon enter the winter. After the cold dew season, the rain is getting less and the weather is dry, often causing difficulties for timely planting and seedling growth of overwintering crops.
The sowing of winter wheat is an important agricultural business of the solar terms, and the area involved is very wide, and there is a difference in the appropriate sowing period. As the farmer said, "cold exposure to frost, species of wheat and panic". Winter wheat is a wintering crop with a long growing period. It takes a long period of time from autumn to next year to return green, jointing, heading, grouting, and formation of yield, especially during the period from sowing to returning green. It coincides with the low temperature and arid climate in winter and spring. In order to ensure the safe wintering of winter wheat and the successful return of green crops to lay a foundation for high yields, it is only necessary to seize the basic link of sowing to cultivate a group of wheat seedlings that are neat, robust, and resistant. For this reason, the application of seed fertilizer is a key measure with obvious and feasible results.
The high yield of winter wheat cannot be ignored. The effect of applying fertilizer is mainly to provide the necessary nutrients for the wheat seedlings. When the seedlings first came out, the roots developed weakly and the ability to absorb fertilizer and water was poor. However, when the winter wheat was planted in vast northern wheat areas, the soil temperature was already low, and the nutrients released from the soil itself were slow, and it was very likely that there was no supply. The winter wheat seedlings, although few in terms of nutrient requirements, are sensitive and strict and need to provide less nutritious nutrition. Therefore, the role of seed fertilizer is to ensure that the wheat seedlings are strong, they can pass through winter and return to green in time. This is one of the keys to the high yield of winter wheat. At this time, fine application of seed fertilizer can improve the ability of wheat seedlings to resist drought and resist cold and achieve the purpose of cultivating strong seedlings.
Fertilizer applied fertilizer? Fertilizer is the most needed fertilizer. Wheat seedlings are very urgent for phosphate fertilizers. They are sensitive to phosphate fertilizers. The seedling stage is also the critical period of phosphorus nutrition. If phosphorus deficiency or severe phosphorus deficiency occurs at this time, both weak seedlings and seedlings will appear. In the case of drought and cold, there is the problem of frozen dead seedlings; after the seedling period, even if additional phosphate fertilizer is applied later, it will not be able to make up for the loss caused by this time.
Therefore, the appropriate nutrient ratio for seed fertilizer is mainly phosphorus, with a small amount of nitrogen. Fertilizer varieties can be compound fertilizer or single fertilizer. For example, diammonium phosphate is commonly used in the northwestern and northern wheat areas, and diammonium phosphate and nitrophosphate can be used in binary compound fertilizers; in the middle and lower reaches of the Yangtze River, the most commonly used fertilizer varieties are low in concentration. Calcium phosphate and ammonium sulfate are suitable. However, urea, ammonium bicarbonate and ammonium chloride are not suitable for seed fertilizer. Because the appropriate nutrient ratio of fertilizer is less phosphorus and nitrogen, usually do not use high-nitrogen compound fertilizer as seed fertilizer, so as to avoid the problem of seedling sprouting or burning seedlings.
How much fertilizer application is reasonable? The amount of fertilizer can not be used in large quantities, and it is necessary to grasp the principle of less and more refined, and promote the use of precise quantities. Diammonium phosphate is suitable for 5 kg/mu. Although its amount is small, it can play the role of “doing four thingsâ€; superphosphate is suitable for 8 kg/mu; ammonium sulfate should not exceed 5 kg/mu.
Finally, the method of application of fertiliser and the location of fertilization are equally important. Regardless of the method of sowing or livestock sowing, the fertiliser cannot be directly contacted with the wheat seed, and the fertiliser is applied at a distance of two or three centimeters below the angle of the wheat seed. It is safe to separate wheat seeds from conventional fertilizers.
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