When processing corn seeds, we should first screen and classify them according to the grain shape to ensure that the same batch of seeds have the same specifications and granularity. In North America, the typical ear of corn in pioneer farmland has the following grain components:
1, the grain size (small, medium and large) and grain shape (round and flat) are different in different parts of the ear;
2. Field temperature, rainfall and variety itself also affect the size and shape of seeds;
3. The grain at the top of the spike is small and round; The grain in the middle of the ear is flat; The granules near the base stem are large and round;
4. Grain shape has nothing to do with yield potential, but the genetic characteristics of varieties are the decisive factors of yield.
1, F- grain flat; R circle;
2.l-shaped particles are larger; M- medium size;
3. According to the actual needs of field production, combined with the sowing characteristics of seeder, it can be further defined as two types of seeds, PDR and PDF, and most of the seeds in the ear belong to these two types.
Second, the effect of grain shape on sowing and yield
1, the shape and size of maize seeds have very limited influence on the emergence rate, bud potential and yield;
2. When sowing, it is more important that whether the seed size is uniform affects the sowing effect;
3. Among all the factors, variety has the greatest influence on yield;
At present, most seeders will be equipped with metering discs with different aperture specifications, and the main parameters can be adjusted to meet the sowing needs of corn seeds with different grain shapes. Please refer to the following table for details:
Three. Matters needing attention in seed treatment before sowing of Wansheng 69
The seeds of 1 and Wansheng 69 are uniform in size. It is suggested that the seeds be dried in the sun the day before sowing, and the seeds can be used for secondary dressing if necessary, which has a good preventive effect on the later prevention and control of pests and diseases!
2. Wansheng 69 has a high seed germination rate, and the recommended sowing amount is 4200 plants/mu, with a maximum of 4500 plants/mu! See the following table for reference density:
Four, Xinjiang Huaxi seed industry tips:
Wansheng 69, a seed industry in Huaxi, Xinjiang, has round seeds, small seeds and high seed purity, and the broken seeds are not higher than 0.3%. Just choose the right seeds!
In order to avoid high double grain rate, please remind the seeder to adjust the sowing method and sow according to the agreed density! After sowing, it is found that the seedlings should be thinned and fixed before the five-leaf stage!