1. Different requirements for seeding

Spring corn is mainly distributed in the three northeastern provinces and the eastern part of the Inner Mongolian region. It is mainly in Jilin Province, and it is mostly rain-fed agriculture once a year. It is generally sown from late April to early May and harvested from the end of September to the beginning of October. Among them, the western part of the producing areas are drought-prone in spring, and they are often robbed for sowing; the growing season in the northern part of the producing area is short, and it is cold in early spring.

The summer corn is mainly distributed in the Huang-Huai-Hai Plain, the Central and South Shandong hills, the Shandong Peninsula, southern Shanxi, and the central Shaanxi, mostly with winter wheat and other overwintering crops. Generally sowing in the middle and early June, and harvesting from late September to early October, the shorter growing period should be used, but it should not be too short, otherwise it is difficult to increase the potential for maize production. Summer corn is vulnerable to summer flooding after jointing. Timely drainage and pest control.

2. Different requirements for fertilization

The yield of spring maize is generally higher than that of summer maize, and the fertilizer demand is also large. However, the soil fertility in Northeast China is generally higher than that in the Huang-Huai-Hai region. Therefore, the specific fertilization amount depends on the production of soil. With regard to the ratio of nitrogen, phosphorus, and potassium for total fertilization, phosphorus in summer maize is lower than that in spring maize, while potassium is higher than that in spring maize.

Spring corn generally has mechanized sowing and fertilizing conditions. If one wants to perform one-time fertilization under the conditions of mechanized fertilization, it is necessary to use high-nitrogen compound fertilizer and increase the amount of fertilization appropriately (for example, 50-60 kilograms per mu), and nitrogen fertilizer is the best among them. Sustained release properties; 1/4 of the total fertilizer and other fertilizers should be applied to soil layers of 5 to 10 cm and less than 10 cm respectively; and when the summer corn is sown, it is difficult to plough the basal fertilizer deeper. N, P and K should be combined with Dingmiao in the 4 to 5 leaf stage. Fertilization also needs to consider the characteristics of crop rotation. Compared with winter wheat, summer maize has the same amount of nitrogen, but the amount of phosphorus used is small, and the amount of potassium applied is large. Therefore, the two crops should be planned in an integrated manner.

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