When it comes to planting season, how to choose corn seeds? What are the eligibility criteria? What should I pay attention to? How to identify new and old seeds?

Corn, also known as Baogu, Baolu, Zizania latifolia, bract rice, sticks, millet, corn, Zizania latifolia, corn wheat, millet, is an important food crop and feed crop. So how to choose corn seeds? What are the eligibility criteria? What should I pay attention to? How to identify new and old seeds? Let's get to know it together.

How to choose corn seeds? What should I pay attention to?

1. Varieties that have not been approved (the key point is not to indicate that they can be grown locally) cannot be purchased. Although some planting yields are good that year, if the climate is not suitable, they may suffer heavy losses; you must choose a few more varieties to buy seeds. In case of climate accidents, resulting in a large-scale reduction in production; beware of buying varieties that have been eliminated. Due to the low price of these varieties, some unscrupulous traders specialize in this kind of business to the detriment of customers.

2. The resistance of varieties should be paid attention to in seed selection. Stress resistance mainly refers to disease resistance, lodging resistance, drought resistance, insect resistance, cold resistance and so on. To put it simply, it means that under the same condition, other varieties suffer little or no damage, and this variety generally has good yield stability.

3. The approval number must be marked on the regular outer package of corn seeds, and there is a corresponding approval number on the package of each variety. For example, the approval number is Guosheiyu 2011007, which means that the variety was approved by the National crop Variety approval Committee in 2011. Whether it is a national trial or local approval of corn seeds, be sure to see whether the suitable planting area includes your area. At the same time, farmers are reminded that seed users who do not have an approval number can refuse to buy.

4. It is true that some seed manufacturers on the market sell old seeds after coating, and it is difficult to identify whether they are old seeds after coating. It is suggested that the coated seeds bought should be tested for germination within 15 days (when doing germination tests, attention should be paid to washing off the coating agent). If the bud is weak (long germination time) and low germination rate, the probability of old seeds is high, so it is recommended to return and replace them.

5. after the crop varieties are announced and revoked in that year, the promotion shall be stopped after the announcement of a production cycle, and can be sold at most until the end of the production cycle after the announcement. Users can go to the local planting law enforcement brigade or seed management station to learn about the list of varieties that have been revoked.

6. The yield of maize is composed of panicles per unit area, grains per panicle and grain weight. It is not that the heavier the 100-seed weight, the higher the yield. 100-seed weight is an indicator of seed size and plumpness.

What is the standard of qualified corn seeds?

The indexes to measure seed quality in China mainly include variety purity, seed purity, germination rate and moisture. The state has also made clear provisions:

The purity of first-class seeds is not less than 98%, the purity is not less than 98%, the germination rate is not less than 85%, and the water content is not more than 13%.

The purity of secondary seeds is not less than 96%, the purity is not less than 98%, the germination rate is not less than 85%, and the water content is not higher than 13%.

How to identify new and old corn seeds?

In general, after long-term storage, the old seeds have dark color, hard embryos, less horniness and more powder, and are easy to be eaten by rice elephants, and there are often fine round holes in the embryo; when the hand is put into the seed bag and pulled out, there is powder on the hand; and the bud potential and bud rate are low, and most of the seeds have germinated in the soil after sowing, but twist can not expose the ground to form seedlings. The new seed has bright color, no wormhole, high germination rate and germination potential.

Why can high yield and high efficiency be achieved only by the combination of improved maize varieties and improved methods?

The so-called matching of improved maize varieties and methods is to adopt corresponding planting methods according to the growth and development characteristics of the varieties, in order to give full play to the advantages of the varieties, overcome the shortcomings, give full play to the potential of increasing production, and achieve the goal of high yield, stable yield and high efficiency.

Different varieties have different growth and development characteristics, and the cultivation methods are not exactly the same. Maize varieties with high yield potential and high yield potential generally have high requirements for fertilizer and water conditions and management measures. In the production practice, this requires that the corresponding cultivation technical measures and management methods should be taken according to the specific characteristics of each variety, and only in this way can the yield-increasing potential of each variety be brought into full play. In other words, the combination of improved varieties and methods can achieve high yield and high efficiency.

In production, corn is required to be sown timely and early. Timely early sowing can not only make the plant strong and root system developed, but also enhance stress resistance, promote early maturity and obtain high yield.

In addition, corn is divided into spring corn and autumn corn. Spring corn is sown in late April and early May and can be harvested in late August. Autumn corn can be sowed no later than mid-July and harvested in mid-late October at the latest.