Maize is a crop that requires more fertilizer. Different growth periods require the use of different types and amounts of fertilizers. The higher the yield, the more fertilizers are applied. We refer to the basic fertilization method, the method of fertilizing the weight of the panicle fertilizer, the weight of the panicle fertilizer, the light weight of the middle weight of the peacule and the light weight of the culm to the old method, and abbreviate the two methods of fertilization of the base fertilizer and the stalk weight, the seedling fertilizer, and the panicle light and the light weight, respectively. The difference between the old and new methods is mainly the amount of female stalk and panicle fertilizer is different, the new method advocates re-application of stalk fertilizer, the old method uses heavy panicle fertilizer. In the practice of corn seed production for many years, we have found that the new method can better meet the normal growth and development of the female parent and is more conducive to improving the seed production. After three consecutive years of production and application of different varieties, the new method has increased production by more than 10% on average, and has worked out a new method of corn seed production and fertilization, and has received very good results. 1 The main content of the new approach The female parent fertilization First, according to the different maternal types, soil conditions and yield design requirements, determine the type of fertilizer applied and the total amount. For every 100 kg of seeds produced, it is generally necessary to use pure N7 kg, sulfur dioxide 3–4 kg, and hydrogen peroxide 6–8 kg. The total amount of fertilizer is calculated according to this standard. For some zinc-deficient land, 2 to 3 kg of zinc fertilizer should be applied every 667 square meters. The second is to grasp the principles of fertilization at the end of the foot, early Miaofei, stalk weight, ear fat Qiao. Base fertilizer should be dominated by farmyard manure and phosphorus and potash fertilizers, topdressing with nitrogen fertilizers and compound fertilizers. The amount of base fertilizer accounted for 30% in each period, Miaofei accounted for 20%, stalked manure accounted for 40%, and ear stage accounted for 20%. The male father of the fertilization should implement high-fat water management, chase the small seedlings to grow large seedlings, chase the weak seedlings as strong seedlings, and master the balance development with the female parent. If the father is found to be late, you should topically apply the available nitrogen fertilizer and foliar spray; if you find that the father is early, you should control the fertilization and less water and deep cultivator to control its growth. 2 Analysis of the reasons for the increase in yield from the new approach The re-application of culm fertilizer has met the requirement of large amount of fertilizer in the jointing and booting stage. The amount of nitrogen, phosphorus and potassium absorbed by maize during different growth stages has significant differences. According to information, 3% of spring corn seedling stage, 49% jointing stage, 22% flowering period and 26% mature stage; summer maize seedling stage 10%, jointing stage 63%, flowering stage and maturity stage only 22% . The jointing period is the period with the largest amount of fertilizers. The amount of nitrogen, phosphorus and potassium absorbed by the spring maize from the soil is 32%, 45% and 70% of the total absorption, respectively, and the summer corn is 76% and 63% respectively. 67% of the stalks can be used to meet the normal growth and development of corn. Repeated application of culm fertilizer is beneficial to the application time of glutinous rice stalk fertilizer, which is generally at the jointing stage of 30 days after emergence. Reapplication of stalk fertilizer can promote the growth of stems and leaves and the formation and development of the ear, prevent the degradation of the small flowers at the top of the ear, thus making the stalks strong. , Ear length, large grain and more. The maturing of the female parent reduced the nutrient consumption to ensure the purity and quality of the seed. Tassel is one of the “growth centers†of corn. Removing tassels in time can reduce the consumption of nutrients, increase the ventilation and light transmission capacity, and is more conducive to the development of the ear, so that the ear can stick out quickly and neatly. 3d. The peasants said that they were early deported when they applied fertilizer. Heavy panicle fertilizer is unfavorable for raising the yield of seed production. Application of panicle fertilizer tends to cause excess nutrients, and the plants are long-lived and make the pods thicker and longer. The lobular leaves are borne on the loquat leaves, commonly known as the "ba-eye leaves." Sometimes it can cause long spikelets on the ear, commonly known as "Baer's cockroach," and a cockroach grows with more than two ears. It also causes difficulty in the leaf of the female ear, weak affinity for pollination, poor seed setting rate, late-maturing lust, and can not be compared. Plant nutrients are quickly transferred to the ear. Therefore, excessive application of panicle fertilizer is not conducive to improving hybrid seed quality and yield.
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