During the big corn flare period, most of the cobs were outstretched, but not all were unfolded. The leaves were clustered and the sides resembled tweeters. This period was the big bell-mouth period of corn. This period generally occurs 45 days after sowing and is a period of vegetative growth and reproductive growth of corn. It is a critical period for field management. The purpose of management at this time is to promote stalk prosperous growth, and it is necessary to ensure that the roots, stems, and leaves of corn plants thrive, and that the ear develops well. In order to ensure high and stable production of corn, the following points should be grasped in the management:
First, top dressing. The big bell-mouth period is a period in which corn needs the most amount of fertilizer and requires the greatest fertility. During this period, top-dressing must be strengthened to prevent de-fertilization. Should be based on soil fertility and seedlings general fertilization, urea 15-20 kg per mu, topdressing 10cm deep into the soil, fertilization after the cover soil, do not sprinkle the surface in order to increase fertilizer utilization.
Second, Pei Peishi. The requirements of nutrients and moisture are strong during the large bell-mouth period of maize. The cultivator can loosen the soil, improve ventilation and water and fertilizer supply, thicken the base soil layer of the plant, promote root growth, and prevent plant lodging. At the same time, removing weeds can achieve water conservation and conservation. Therefore, cultivator is an important measure for the management of large bell seasons.
Third, watering. The corn big bell season coincides with the high temperature season and is a critical period for corn water demand. Watering after fertilization can change the microclimate in the field, which is beneficial to pollination of corn and increase the seed setting rate. It is necessary to ensure that the soil is not arid in the period from the big bell mouth to 25 days after grouting. Fourth, pest and disease control. This period is mainly for controlling corn borer, cotton bollworm, red spider, and aphid. You should always go to the field to investigate the occurrence of pests and diseases. Corn cockroach with 50% phoxim EC, 90% crystal trichlorfon, 48% chlorpyrifos 500 ml plus appropriate amount of water, mixed with 25 kg of fine sand or fine dry soil, made of toxic soil irrigation heart, control effect is better. The red spider used 45 ml of 1% Fenlin EC and sprayed with 50 kg of water. The cotton bollworm was controlled by droplets of 400-fold droplets of the pyrethroid pesticide.
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