The sowing of winter wheat is an important agricultural task in this festival, and the area involved is very wide. The suitable sowing date varies from place to place, just like the farmer's house cloud: “cold dew to frost, planting wheat is panic.†Winter wheat is a wintering crop with a long growth period. It takes a long period of time from autumn to new year, greening, jointing, heading, grouting and yield formation, especially the sowing to greening, which is the cold and arid climate in winter and spring. In order to ensure the winter wheat safely and smoothly return to green, and then lay the foundation for high yield, only by grasping the basic link of sowing, it is necessary to cultivate a tidy, strong and resistant wheat seedling group. To this end, the application of fertilization is an obvious and feasible key measure.
The high yield of winter wheat is not negligible. The effect of applying fertilizer is mainly to provide the required nutrients for the wheat seedlings. When the seedlings just came out, the roots developed weakly, and the ability to absorb fertilizer and water was very poor. However, in the northern wheat area, when the winter wheat was planted, the soil temperature was already low, and the soil's own nutrient release was slow, and there was a possibility that the supply would not be available. Although the demand for nutrients in winter wheat seedlings is small, it is very sensitive and strict, and it needs to supply less and better nutrition. Therefore, the role of the seed fertilizer is to ensure that the wheat seedlings are young and vigorous, and they will survive the winter and return to green in time. This is one of the keys to high yields of winter wheat. When this kind of fertilizer applied to refined wheat seedlings can be improved drought cold tolerance, to achieve the purpose of cultivation of seedlings.
What fertilizer is applied to the fertilizer? The most needed fertilizer is phosphate fertilizer. The need for phosphate fertilizer is very urgent. It is sensitive to the reaction of phosphate fertilizer, and the seedling stage is the critical period of phosphorus nutrition. At this time, if the supply of phosphorus is insufficient or severe phosphorus deficiency, both seedlings and seedlings will appear. In the face of drought and cold, and froze to death seedlings problem; and over the seedling stage, even after the fix P fertilizer at this time can not compensate for the loss caused.
Therefore, the appropriate ratio of nutrient to nutrient distribution should be based on phosphorus, with a small amount of nitrogen. Fertilizer varieties can be compound fertilizer or single fertilizer. For example, the commonly used varieties of fertilizers in the northwest and north China wheat regions are diammonium phosphate. In the binary compound fertilizer, diammonium phosphate and nitrophosphate can be used. In the middle and lower reaches of the Yangtze River, the most commonly used varieties are low concentrations. Calcium phosphate and an appropriate amount of ammonium sulfate are preferred. However, urea, ammonium bicarbonate and ammonium chloride are not suitable for seed fertilizer. Since the suitable nutrient distribution ratio of the seed fertilizer is less than the phosphorus and nitrogen, it is generally not necessary to use the high nitrogen compound fertilizer as the seed fertilizer, so as to avoid the problem of the seedlings being weak or burning.
How much is the amount of fertilizer applied? The amount of fertilizer should not be too much. It is necessary to master the principle of less and finer and promote the application of precision. Diammonium phosphate is suitable for 5 kg / mu. Although its quantity is not much, it can play the role of “ four or two pounds â€; calcium superphosphate should be 8 kg / mu; ammonium sulfate should not exceed 5 kg / mu.
Finally, the application method of the seed fertilizer and the location of the fertilization are also very important. Regardless of whether the machine is broadcasted or the animal is broadcasted, the seed fertilizer cannot be directly contacted with the wheat, and the fertilizer should be applied to the two or three centimeters below the oblique direction of the wheat. It is safe to separate the wheat from the conventional fertilizer.
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