(1) Select seeds according to heat resource conditions.
Generally speaking, maize varieties with long growth period have good yield performance and great potential for increasing production, and the local heat and growth period should meet the needs of full maturity of varieties. Therefore, the selection of maize varieties should not only ensure the normal maturity of maize, but also not affect the timely sowing of the next crop. Terrain is related to ground temperature, which is high, so it is advisable to choose late-maturing varieties or middle-late-maturing varieties with long growth period; Mid-late maturity varieties are suitable for flat growth period; Middle-early maturing varieties should be selected in low-lying areas. (2) Selecting seeds according to production management conditions.
The high yield potential of maize varieties is related to production management conditions. Varieties with high yield potential need good production management conditions, while varieties with low yield potential need relatively low production management conditions. Therefore, in areas with high production management level, fertile soil and sufficient water resources, corn varieties with high yield potential and high yield can be selected. On the contrary, varieties with low production potential but good stability should be selected.
(3) Selecting seeds according to the previous planting conditions.
The increase in yield and income of maize varieties is directly related to early planting. If soybean is planted in the previous crop, the soil fertility is good, and high-yield varieties should be selected; If the previous crop is planted with corn, and it grows well and has high yield, you can continue to choose this variety; If the previous corn is infected with diseases, then the varieties susceptible to diseases should be avoided when selecting seeds. In addition, the same variety cannot be planted in the same land for three or four years, otherwise the land will be barren and the variety will be degraded.
(4) Selecting seeds according to their appearance.
The purity and quality of maize varieties directly affect the yield of maize. When the purity of first-grade corn seeds (purity 98%) is reduced by 1%, the yield is reduced by 0.6 1%. Selecting high-quality varieties is a favorable guarantee to realize high yield of maize. The high-quality seed packaging bag is sealed once, with the name, detailed address and telephone number of the subsidiary; Whether the production date, purity, moisture and germination rate indicated on the seed label are clear; The shape, size and color of the seeds are the same.
(5) Selecting seeds according to precipitation and accumulated temperature.
According to experience, the snowfall last winter was small and it was not cold in winter. In the next summer, there will be more rainfall and the accumulated temperature will not be high. Varieties with long growth period often have insufficient accumulated temperature, which often affects maturity. On the contrary, there was a heavy snow last winter, which was very cold in winter, and the rainfall in the following summer was generally less and the accumulated temperature was higher. Varieties with strong drought resistance should be selected, and some middle-late maturity varieties can be planted in depressions.