"I don't want to pour, the crops look at the world." Whether corn needs to be watered depends on the growth and development of the corn, the weather conditions and the soil moisture content. If the soil water content is less than 16%, the clay water content is less than 20%, and the sand soil moisture content is less than 12%, that is, watering is required. From the perspective of corn development and the period of great impact on yield, it is generally necessary to pour 4 key waters.
Water
1. When planting, good soil moisture is the guarantee to realize Miaoquan, Miaoqi, Miaozhuang and Miaoyun. If the soil is insufficiently or unevenly planted, it will inevitably lead to the lack of seedlings and ridges, or the size of the seedlings will be uneven, the number of weak and small plants will be high, and the empty stalk rate will be high. It is impossible for such a group to obtain high yield. The appropriate soil moisture for corn planting is between 65% and 75% of the field water holding capacity. If the soil water content is less than 65% of the field water holding capacity at the time of sowing, it must be sown after sowing, and the summer corn can also be sown and poured into the "head water". It is best to carry out winter irrigation and early spring protection in the spring corn area. Winter irrigation should be poured thoroughly. Summer sowing or interplanting corn can be combined with pouring wheat yellow water. The amount of irrigation is generally 50 to 60 cubic meters per mu. If you water the "Mengtou" water, generally 40 to 50 cubic meters per acre.
Joint water
2, the corn seedlings are small, drought-tolerant, and fearful of phlegm. The suitable soil moisture is between 60% and 65% of the field water holding capacity. Under normal circumstances, it is not necessary to water. However, after the jointing of the corn, the plant grows vigorously, the tassel and the ear begin to differentiate, and the water requirement increases. If the soil water content is less than 65% of the field water holding capacity at the jointing stage, watering is required, generally 55 cubic meters per acre. Left and right, pouring water and water for stems and leaves and female growth and florets differentiation, can reduce empty stalks and increase the number of grains per ear. For example, in the high-yield spring corn field in Yanqing County and Huairou County of Beijing, the number of spiked grains in the water-saving and water-saving increased by an average of 51.6 (11% increase), and the number of ears per mu increased by 3.8%.
Heading water
3, before and after the flowering period of corn, the leaf area is large, the temperature is high, and the evapotranspiration is strong. It is the period when the corn needs the most water and is most sensitive to water. At this time, the suitable soil water content is 70% to 80% of the field water holding capacity. If it is less than 70%, it should be watered, and 55-60 cubic meters per acre. At this time, irrigation can improve the viability of corn pollen and filament, and facilitate pollination and agglomeration; it can extend the functional period of the leaves, improve photosynthetic capacity, and increase dry matter production. It is beneficial to grain filling, reducing grain abortion, increasing the number of stable grains and increasing 1000-grain weight. Irrigation and earing water must be timely, filling the feet, can not wait for the rain, if it is found that the leaves are wilting and then watering is late. According to the test, short-term drought before and after stagnation, causing leaves to wilting for 1 to 2 days and then watering, will also reduce production by 20%.
Grouting water
4. More water is still needed during grain filling. The suitable soil water content is 70% to 75% of the field water holding capacity. If it is lower than 70%, it will be filled with water. Under normal circumstances, the water per acre is about 55 cubic meters. Irrigate at this time. It can prevent premature senescence of plants, maintain more green leaves and maintain high photosynthesis; it can prolong grain filling time and increase filling speed, which is beneficial to increase grain weight.
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