What time is corn planting?
Corn planting time
Corn is divided into spring corn and autumn corn according to the planting time. Spring corn is planted in early May in late May and harvested in late August. Autumn corn can not be planted later than mid-July, and harvested in mid-to-late October. In the whole life of corn, according to morphological characteristics, fertility characteristics and physiological characteristics, it can be divided into several different growth stages. Each stage includes different birth stages. These different stages and periods have their own characteristics and are closely related. Contact.
1. Seedling stage
Maize seedling stage refers to the period from sowing to jointing. It is a vegetative growth stage with rooting and differentiation of stems and leaves. The characteristics of fertility at this stage are: roots grow faster, but the growth of stems and leaves in the shoots is relatively slow. To this end, the central task of field management is to promote the development of the root system and nurture strong seedlings to meet the requirements of “four seedlings†that are seedling early, seedlings, seedlings, and seedlings, and lay a solid foundation for high yields of corn. This stage is divided into the following two periods.
1 sowing period: seed germination, groundbreaking and emergence. At this time, we must pay attention to the planting density, improve the quality of sowing, and not affect the emergence of seedlings. 30-40% of nitrogen fertilizer and all phosphate fertilizer and potassium fertilizer. In some areas, zinc fertilizer and sulfur fertilizer can be applied in an appropriate amount. After the seedlings are planted, the Heilongjiang area is prone to spring drought, affecting the emergence rate. Mild drought is conducive to the development of the root system and the lowering of the roots. A living seed is buried in the soil. When the outside temperature is above 8 degrees, the moisture content is about 60%, and the aeration conditions are suitable, the seedlings are generally released after about 10 days. By the end of the three-leaf period, the storage of nutrients in the seeds will be depleted, known as “milk-out period,†which is the first stage of corn seedlings. Soil moisture at this stage is the main factor affecting seedling emergence. In addition, the seeding depth directly affects the speed of seedling emergence. Seedlings that emerge early are usually stronger than those that emerged later. According to the experiment, the seeding depth increases by 2.5 cm, and the average seedling stage delays. One day, the seedlings are weak.
2 Three-leaf stage: The seedlings, three-leaf stage and jointing stage are the long roots, differentiated stems and leaves, the stems and leaves grow relatively slowly, and the roots develop rapidly. At this point we must pay attention to promote root growth, strong seedlings to ensure early emergence, high emergence rate, emergence Qi. The three-leaf period is the first turning point in corn's life. Corn turns from self-supporting to heterotrophic life. From the three-leaf stage to the jointing, due to the underdeveloped roots and leaves of the plants, the nutrients absorbed and produced are limited, and the seedlings grow slowly, mainly for root and leaf growth and stem segment differentiation. When the corn seedlings are afraid of cockroaches, they are not afraid of drought. If they are light, they will affect growth, but they will cause dead seedlings and mild drought, which is conducive to the development of the root system and the lowering of the roots.
2, jointing period
60-70% of the total amount of nitrogen fertilizer is applied as a top dressing, and the growth is good at one time in the big bell stage. The long-term difference is applied twice in the jointing stage and the big bell mouth. It is required to apply a fertilizer depth of 10cm and cover the soil in time.
3, big bell mouth period
During the jointing stage, the big trumpet period and the tasseling stage, the stems are rapidly elongated, the leaves are rapidly enlarged, the roots are developed, and the male and female ears are differentiated. At this point should pay attention to promote leaves, strong stalks, to prevent lodging, increase ear growth. A certain period of time from the jointing to tasseling of corn is called the ear period. Jointing is the second turning point in corn life. The growth and development characteristics of this stage are: vegetative growth and reproductive growth are carried out at the same time, that is, the vigorous growth of vegetative organs such as leaves and stem sections and the strong differentiation and formation of reproductive organs such as male and female ear. This period is the most vigorous stage of growth and development in corn, and it is also the most critical period of field management. For this reason, the central task of field management at this stage is to promote the enlargement of the middle and upper leaves, and the prosperous growth of the stems, in order to achieve the purpose of multiple spikes and spikes. Use foliar fertilizer.
4, tasseling period
The period from the pumping of males to maturity is called tasseling. When the corn is drawn and loose powder, all the leaves have been expanded and the plants have been fixed. The fertility characteristic of this stage is that it basically stopped the growth of the vegetative body, and entered the stage centered on reproductive growth, and there was a third turning point in the life of corn. For this reason, the central task of field management at this stage is to protect the leaves from damage and premature aging, and to strive for more grain and weight to achieve high yields.
5. Mature period
Corn enters the stage of flowering, pollination, fertilization and endosperm cell division. At this time, it is necessary to pay attention to the roots of the leaves, prevent lodging, prevent aging, and increase the number of grains.
Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone
Pumpkin Seed Kernels,Pumpkin Seeds Kernels Roasted,Shine Skin Pumpkin Seed Kernels,Pumpkin Seeds Or Kernels
Wuyuan county dafeng oil food co.,ltd , https://www.dafengfood.com.cn