1, fertilization. Maize jointing to booting is the period when most fertilizer is needed, especially the large bell-mouth period (leaf age index is about 60%), which is the key period for determining the size of the ear and the number of grains. This period should be re-application of nitrogen fertilizer, application of urea 20-25 kg per acre. Fertilizers should be deep-seated and applied at a depth of 10 cm and 12-15 cm from the plants. In the tasseling to the flowering period, it is necessary to make up the grain fertilizer, and generally apply urea of ​​7.5-12.5 kilograms per mu. 2, watering. From jointing to tasselling, corn enters a vigorous growth stage, especially about 10 days before tasselling. The water requirement is higher and it is the critical period of water demand. At this time, the relative soil moisture content is preferably 70%-80%. Maize tasseling until the flowering stage is very sensitive to the water response, is the peak period of water demand, the relative soil moisture content should reach 80%. The formation of kernels to wax ripening is an important stage in determining corn yields and still requires sufficient moisture. This period, the relative soil moisture content of 70% -75% is appropriate. In each of the above periods, if the soil moisture content is below the lower limit of the appropriate moisture content, it should be watered. At the same time, it should be drained in time. 3, prevention and control of pests and diseases. The corn borer is the main insect pest during the earing stage. 250 grams of 3% phoxim granules per acre can be used to mix 5-6 kg of fine sand, sprinkled on the corn leaf or leafhopper, and on the tassel leaf and ear. For the control of corn leaf spot, 50% carbendazim or 50% trehalose 500 times spray can be sprayed once every 5 days and sprayed 2-3 times. 4, remove the small strains. Before and after tasseling and before and after silking, a small number of small and weak plants with no knotting ability can be removed, which can save water, fertilizer, and ventilation in the field. 5, artificial castration. When the tassels of the male tassels have bare their top leaves and there is no loose powder, the tassels are removed by interlacing or septa (two lines at the edge do not castrate) so that the nutrients are concentrated to supply the ear. 6, artificial aid pollination. In order to ensure complete pollination, in the late stage of tassel loosening, it is necessary to examine each plant one by one. Artificial pollination is required for fresh filaments that have not been pollinated. 7, appropriate late receipt. In the case of not affecting the planting of post-planting crops, it is necessary to collect them properly. In order to achieve the purpose of late harvest and increase production, the management of fertilizer and water in the middle and later stages of corn must keep up to ensure the maturity of the live leaves of green maize. The harvest was achieved when the corn glutinous leaves turned white, loose, the granule milkline disappeared, and the contents hardened completely. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
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