After the joints of spring maize, the external plants grew rapidly, and the internal tassels and the ears were successively differentiated. In the differentiation stage, the tassels were slightly earlier than the female ear. When one or two leaves of the plant remain unextended, it is commonly known as the trumpet to the big trumpet period. The male and the female spikes differentiate into the four-molecule stage and the floret differentiation stage respectively. The tassel is the critical period for pollen formation, while the female ear It is a crucial period for determining how many florets can be formed, and how much the floret determines how many grains can be made. During this period, nutrition and water supply play a decisive role. After a long period of growth and development of corn, available nutrients in the soil have been consumed. If the nutrients cannot be added in time, the ear differentiation can be met, and the ear differentiation will be affected. Effects, resulting in abortion, reduced pollen volume, decreased activity, decreased normal florets on the ears, reduced the number of grains per panicle and reduced yield. Therefore, this is a critical period for reclaiming panicle fertilizer. In water and soil, it is necessary to seize the time for more than 20 kilograms of ammonium nitrate or urea per acre. It is advisable to open a 20-cm deep hole at a position about 25 cm away from the plant and apply it to the top dressing. After the cover is covered with soil, then the groundwater is poured. After the water penetrates into the ground, the soil is intensively ploughed once, and the ground is hardened. At the same time, the soil is cultivated to promote aerial root growth, increase plant absorptive capacity, and reduce lodging.
Due to the lack of irrigation conditions in the drylands, it is difficult to strictly control the topdressing period and can only be operated flexibly according to soil moisture conditions. Generally can be based on the application of base fertilizer, after the jointing period to the trumpet period, with the rain top dressing, that is, after the rain, when the soil is enough to cover fertilizer, top dressing amount should be based on the amount of base fertilizer and seedlings flexible grasp, base fertilizer application More seedlings are stronger, and mu can recover 7-10 kilograms of ammonium nitrate or urea. The amount of base fertilizer is less, the seedlings are weaker, and when the lye is better, it can recover more than 15 kilograms of mu, and after the top dressing, the cultivator loosens soil. In addition to compaction, it reduces fertilizer loss.
The bell-mouth period is also a critical period for preventing and controlling corn borer. It can use 50% phoxim EC 50 milliliters, dilute 0.5-1 kilograms, add 5 kilograms of slag clogged, and mix 1-2 hours to make granules. Put it into the bell mouth of the heart, about 3 grams per plant can be; you can also use 150 ml of BT emulsion per acre, mixed with 15 kg of sand to make granules, each with 3 to 4 grams into the heart.
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