Surgical Gowns,Medical Surgical Gown,Isolation Surgical Gown,Disposable Surgical Isolation Gown Xinxiang Huaxi Sanitary Materials Co., Ltd. , https://www.huaximedical.com
The continuous drought in the autumn, winter and spring seasons also greatly affected the cultivation of 2 million mu of spring maize in our province. For the comprehensive cultivation techniques of spring maize dry cultivation, the reporter interviewed Li Zongxin, a researcher of the maize cultivation department of the Shandong Academy of Agricultural Sciences, with a view to providing support for drought-prone cultivation of spring maize farmers in the province. Selection of drought-resistant varieties of drought-resistant seed varieties can be selected in Ludan 981, Yandan 20, Zhengdan 958, Ludan 818, Danyu 86, Nongda 108, Dongdan 60, etc., according to local conditions. Generally developed roots, stems and leaves more hair, high photosynthetic intensity and drought resistance and high yield. Second, the drought-resistant exercise on the seeds. The main method is to use a wet-dry cycle method to treat seeds, that is, soak the seeds in water at 20-25°C for two days and nights, remove them and let them dry. In addition, you can also use pesticide soaking method, with calcium chloride 1 kg water 100 kg, soaking (or boring) 500 kg, 5 to 6 hours to sow; or soaked with 20 to 40 naphthylacetate, drought resistant seedlings of corn There are also good results. After the drought-resistant seeds, the roots grow fast and the seedlings are short-lived, which can generally increase production by 10%. There are two types of spring corn, pre-winter farmland and spring farmland, and some areas use pre-winter plowing to apply basic fertilizer in some areas. The soil depth is generally about 25 to 35cm. Spring arable land can also be combined with the application of basal fertilizer, early ploughing, shallow depth should not be appropriate, immediately after ploughing, avoid soil loss. Especially in spring drought and windy areas, it should be repeated many times to make the soil virtual reality. Squeeze and re-twease before sowing to ensure maize emergence. Appropriate sowing and tillage to ensure the appropriate sowing date of spring maize, we must consider the temperature, lyrical and species characteristics and other factors, our province generally sowing in mid-April. (1) The following measures can be adopted for sowing the spring corn planted with dry water. If the soil moisture content (soil moisture content below 12%), the use of deep pod species, generally deep species can be 10 ~ 12cm; in the case of good soil moisture, sowing depth of 5 ~ 6cm is appropriate. Robber sowing. After the soil thawing in early spring, there is much moisture in the surface layer or high humidity after rain. The sowing date can be 10 to 15 days earlier and sowing. Raise sowing. Before corn sowing, the surface dry soil has reached about 6cm, but when the soil of the lower layer is still in good condition, the ground surface can be promptly repressed before and after sowing to compact the soil, increase the contact surface between the seed and the soil, and promote the increase of soil moisture in the lower layer. Wait for rain sowing. Long-term drought, difficult to use other drought-resistant measures to ensure the emergence of corn, it is necessary to use early-maturing corn varieties, to be sown in time after sowing. (2) Spring corn in irrigated land can be irrigated as needed, timely sowing, improving the quality of sowing, and achieving high and stable yields. Generally, winter irrigation and early spring irrigation are performed on the basis of autumn cultivation. Winter irrigation is better than spring irrigation, irrigation in early spring is better than late irrigation, and areas where conditions permit are as early as possible after soil thawing and early spring irrigation. Fertilizer-fertilizer soil has a large amount of fertilizer required for fertilizer-adjusted corn, and generally requires the application of 1 to 2 tons of organic fertilizer or soil fertilizer and 40 to 50 kg of compound fertilizer per hectare of base fertilizer. Appropriate application of organic fertilizer can improve the physical properties of soil, enhance the ability of soil to store water and retain water, facilitate the extension of the root system of maize to deep layers of the soil, and improve the ability of drought resistance of maize. At the same time, increasing the amount of straw and roots to be returned, appropriate application of chemical fertilizers, and inorganic promotion of organics can effectively increase the utilization of soil moisture. In addition, it can also be used to cover the grass cover. Spring corn film can warm the soil and cover wheat straw or wheat straw, which can reduce ground water evaporation, reduce surface runoff and increase soil moisture. The use of chemical preparations to maintain warmth first, the use of water retention agent. The coating, coating, and root treatment of the seeds can adjust the soil moisture content and act as a "soil reservoir" to increase the emergence rate. The second is the spraying of drought-resistant agents. It can increase the root activity of maize, prevent premature aging, reduce the opening degree of plant stomata, slow down evaporation, improve the water status of plants, and facilitate the increase of production. The third is spraying the warmer on the soil surface. It can increase soil temperature, inhibit water evaporation, reduce heat loss, maintain soil moisture, ensure seedlings are full, seedlings are uniform, Miao Qi, and seedlings are strong.