1. Strictly prevent the harm of "card neck drought"
The maximum water consumption intensity of corn during the tasseling period is the critical period of corn water demand. Drought and water shortage will cause different degrees of yield reduction or even harvest, which will seriously affect the yield. When the soil relative water content is less than 70%, it should be watered in time. Avoid drought and reduce production.
The current weather is hot and the temperature is high. During this period, high temperature seriously affects the development of maize ears, resulting in reduced yield. Therefore, in addition to breeding heat-resistant varieties, we use artificial-assisted pollination to increase the seed setting rate. Fresh pollen is usually collected at 8-10 am in the morning, and the pollen is pollinated with a homemade pollinator. The pollen should be used with the harvest. The second is to strengthen the management of fertilizer and water, use panicle fertilizer to increase the ear, and foliar spray fertilizer to increase nutrition and reduce temperature and increase application. Enhance the water supply, use sprinkler water to reduce the temperature of the canopy and timely replenish the water needed for the leaves to breathe, and conditionally spray the water directly onto the leaves.
2, timely drainage
In addition to the hot weather, the northern rainy season has arrived, and the southern Yiyi is also prone to drought. During this period, the climate change is the most severe, and different degrees of lightning will occur one after another. Therefore, if you want high yield, you must pay attention to field management, timely draining, and reduce damage. .
The impact of continuous rainy weather during corn tasseling
The continuous rainy weather during corn tasseling may result in insufficient light and heat, photosynthesis weakened, normal growth is inhibited, unfavorable for flowering pollination, and has a great impact on later yield.
Continuous rainy days lead to a decrease in temperature, which will result in short flowering time of tassels, less loose powder, loss of vitality of pollen, continuous rainy days, long rainy days, filaments will automatically age without pollination, insufficient pollination, poor fruiting , affecting the normal development of early spikes. In the late stage, the number of grains per ear was reduced, and the number of grains missing was large, which affected the yield.
Excessive precipitation causes excessive humidity in the field, excessive growth of stems, thinning of stems, loose soil, and prone to windy weather at this time, which may cause corn to fall. Corn is in a high-humidity environment, the pathogens are easy to spread, and pests and diseases are frequently affected, which affects the later yield.
3. Prevention and control of pests and diseases (corn borers)
The most serious damage to summer sowing corn is corn borer, which causes its yield to be seriously reduced. After the corn is plucked, the stalk is drilled, the tassel development is hindered and the yield is reduced, and the ear is eaten at the ear stage, and the tender grain causes grain defects and mildew. decline. From the end of July to the beginning of August, it is the adult and egg-bearing period. Therefore, during this period, attention should be paid to black moths, natural enemies, Trichogram bees and drug control. For example, use Fuch + Yang Cai + crown unpaired water spray, Avi Salt emulsifiable concentrate or cyfluthrin and other chemicals.
In mid-August, the larvae are in the peak period. In the corn snoring period, most of the larvae of the corn pupa are concentrated on the tassels that have not yet been extracted. Therefore, before the tassels have just been taken out, two-thirds of the males are manually removed. The ear is taken out of the field for treatment, which can eliminate about 70% of the larvae, and at the same time, it is also one of the measures to increase corn production.
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