Which principles should be followed in the selection of cotton varieties?
Scientific seed selection is the first pass of cotton production. The selection of superior varieties should follow the following three principles:
First, the principle of examination and approval. The state stipulates that the varieties must be approved by the national or provincial variety approval committee before they can be used in production, so it is necessary to purchase the approved varieties as species for production.
The second is the principle of ecological zone. The selected varieties should be suitable for the ecological conditions of this cotton area.
The third is the principle of familiarity. Because the maturity of varieties has special requirements on sowing season and ecological region, varieties with different maturity can not be sown in the wrong season. When buying varieties, we must see clearly the growth period index of short-season cotton. Short-season cotton cannot be sown in spring. Mid-maturing and mid-early-maturing spring cotton varieties are required to sow in spring, not as short-season cotton in June and summer.
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There is plenty of room for cotton variety selection.
Recently, a number of readers have asked our newspaper for help to buy seeds of new varieties of insect-resistant cotton and hybrid cotton. Due to the small number of provenances and tight market, most of the readers failed to achieve their wishes. In the face of the situation of cotton seed supply this year, how can cotton farmers choose their own cotton varieties by contacting the relevant departments such as the Agriculture and Forestry Department of Jiangsu Province for planting stations? the author believes that there is still a lot of room for cotton variety selection. For cotton farmers who are going to interplant in cotton fields, it is best to select cotton varieties with strong plant growth and good insect resistance, which can enlarge the row spacing of cotton.
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What is the reason for the withered and yellow azaleas
Poor management of rhododendron flowers in the first year often leads to withered buds in the second year. When the cuckoo blossoms, people like to watch it indoors, but the air is not fresh and there is not enough sunshine. The climate in Shanghai is too warm, so it can be moved outdoors at night and placed in the indoor light place in the morning and evening. After the flowers fade, gradually increase the time to be placed outdoors, and a week later, you can put them in a shaded place outside and cut off the residual flowers in time. Nitrogen-based liquid fertilizer was applied every 10 days to promote new shoots. The weather is hot from June to August, the growth of rhododendron is slow, and fertilization can be stopped. Late September, every 10 days
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