Compared with most other crops, the particularity of tobacco leaves is that it harvests the leaves. Tobacco leaves are the roots of tobacco plants that are constantly absorbing nutrients and moisture from the soil. Therefore, in order to cultivate good quality tobacco leaves, water and fertilizer management in tobacco fields is very important. Scientific Fertilization Ensures Yield Quality Soil provides nourishment and moisture for tobacco plants. Different types of soils have different structures and nutrients. In order to meet the growing needs of tobacco plants, it is necessary to change the nutritional structure of the soil through fertilization. Tobacco is a crop that is extremely sensitive to fertilizers. Fertilizer type, fertilization amount and fertilizer ratio, fertilization time, and fertilization methods all have a great impact on the yield and quality of tobacco leaves. Fertilizer application is too little, nutrient supply is insufficient, can not achieve the intended production purposes; excessive application of fertilizer, will greatly reduce the quality of tobacco leaves, not only increase production costs, but also reduced the quality of tobacco leaves. Therefore, scientific and rational fertilization is the key to producing high-quality tobacco. In the process of fertilization, it is necessary to grasp the following points. First of all, it is necessary to determine a reasonable amount of fertilizer based on ecological factors such as soil type, water resources, and climatic conditions. Loose land or too much rainfall, the nutrient easy to lose, to increase the appropriate amount of fertilizer; soil viscous plots or when the rain is too small, should be appropriate to reduce the amount of fertilizer to avoid slow release fertilizer effect caused by greed and late maturity of tobacco. Second, it is necessary to determine a reasonable fertilization method based on the characteristics of tobacco growth. After transplanting tobacco seedlings, the absorption of various nutrients such as nitrogen, phosphorus, and potassium in the early stage is very small. With the passage of time, the absorption rate of nutrients by tobacco plants gradually increased, and began to increase sharply one month after transplanting, and reached the maximum about 55 days after transplanting, and then declined rapidly, among which nitrogen was again Absorption decreased most rapidly, followed by potassium, and phosphorus absorption was relatively stable throughout the growth period. Therefore, the supply of fertilizers should be "less rich, old and poor" to meet the growth needs of tobacco. The fertilization in the tobacco field is usually based on the combination of basal fertilizer and topdressing, and the basal fertilizer is re-applied, and the fertilizer is applied sparingly or applied early. In the application of basal fertilizer, double fertilization method is often used. Before transplanting and when ridging, apply 2/3 of the total amount of fertilizer to both sides of 15 cm away from the smoke, with a depth of about 20 cm to ensure the growth of tobacco plants in the front and middle stages after transplanting. Topdressing can not only ensure the nitrogen supply in the middle and late stages of tobacco growth, but also prevent the premature decline of defertilizer during the mature period of tobacco. At the same time, it can also increase or decrease the amount of topdressing fertilizer according to the long-term, soil and climate conditions of the field tobacco plants to correct the original. The amount of fertilizer used for the plan. If all the fertilizers are used as basal fertilizers, excessive amounts of fertilizers will have an adverse effect on the quality of tobacco leaves. Therefore, top dressing is also a remedy to adjust nitrogen. When topdressing, it is necessary to apply weak seedlings and seedlings to promote cultivation of strong seedlings. This is an effective means to increase the uniformity of tobacco seedlings in tobacco fields. For those lands with poor water retention and fertility, potential nitrogen deficiency, and weak late-stage nitrogen supply capacity, as well as lands with excessive early and medium-term rainwater and severe nutrient loss, top-dressing is to ensure the supply of nitrogen nutrients in the middle and later stages of tobacco plants. The effective means to stabilize the yield and quality of tobacco leaves. Topdressing can be done by irrigating roots and applying roots. Under normal circumstances, 25 days after transplanting, use potassium nitrate solution (ternary compound fertilizer or diammonium phosphate solution) to root, according to the amount of rainfall and growing seedlings 2 to 3 times fertilizer. To the late stage of tobacco seedling growth, there may be potassium deficiency in tobacco leaves. In this case, according to the growth of tobacco leaves and soil fertility, an extra-root fertilizer application method is adopted, with a 0.2% concentration of Greenfield solution or a 0.5% concentration of dihydrogen phosphate. Potassium solution is sprayed on both sides of the blade. In the period of tobacco leaf group, long-term and prosperous period, each spray should be applied again. Because the rate of absorption of nutrients by tobacco seedlings is 3 to 10 times greater at night than during the day, spraying at night or in the evening is preferable. To select the windless weather spray, in order to facilitate the absorption of tobacco seedlings. According to the growth characteristics of tobacco, reasonable irrigation and drainage Water is the basis for the growth and development of tobacco leaves and the quality of tobacco leaves. According to the characteristics of the moisture requirements of different growth stages of tobacco leaves, using reasonable irrigation and drainage methods to maintain the appropriate moisture in the tobacco field is a necessary condition to ensure the quality and stability of tobacco leaves. In the seedling stage of tobacco seedlings, the tobacco plants have a small amount of nutrients, less evaporation, and the tobacco field consumes little water. However, due to the damage to the root system during transplanting, the absorptive capacity is reduced, and the transpiration of the aerial parts is still underway. The moisture in the tobacco plants is often lost and the wilting of the tobacco plants is caused. Therefore, there should be sufficient water supply at the seedling stage to increase the bottom pods, promote the rooting and return of seedlings, and increase the survival rate of transplanted tobacco seedlings. The soil moisture content during this period should reach 70% to 80% of the maximum field capacity. In the root extension period of tobacco seedlings, while the roots grew rapidly, the stems and leaves also gradually grew, and the transpiration from the main surface evaporation to the main leaf transpiration, the water consumption gradually increased. If the soil moisture is insufficient, the growth of tobacco plants will be hindered; however, if the water supply is too much, it will affect the growth of tobacco roots, and it should be maintained that the soil moisture content is about 60% of the maximum field capacity. Tobacco leaves prospered for a long time, which was the period when the growth of tobacco leaves was most prosperous and the accumulation of dry matter was the most. The stems of tobacco plants grew quickly and thickly, and the leaves expanded rapidly and expanded, and the roots grew further. The physiological activity of the tobacco plants was strong, and the transpiration increased rapidly. The water consumption form was dominated by leaf transpiration. If the water supply is insufficient during this period, it will cause irreparable impact on the yield and quality of tobacco leaves. Therefore, it is necessary to intensify irrigation and maintain the soil moisture to more than 80% of the maximum field capacity in order to meet the needs of the tobacco plants. In the mature stage of tobacco leaves, after budding, the tobacco leaves mature gradually from bottom to top. The physiological activities of tobacco plants are mainly the synthesis, accumulation and transformation of dry matter. With the increase of harvest times, the leaf area coefficient of field decreased gradually, and the transpiration intensity decreased accordingly. The form of water consumption in tobacco fields gradually turned from leaf transpiration to surface evaporation, and water consumption decreased. In order to make the tobacco yellow and mature normally, soil moisture should be maintained at about 70% of the maximum field capacity in this period. Tobacco is a crop that is extremely sensitive to flooding. Excessive moisture is harmful to the growth of tobacco leaves. Excessive soil moisture will cause lack of soil air, affecting root development and tobacco leaf growth. In severe cases, it will cause the death of tobacco plants; flooding during ripening will cause bottom bake, dry matter will not accumulate, leaves will be thin, no aroma, sugar, The decrease in alkali content seriously affects the quality of tobacco leaves. Therefore, in the rainy season, we must actively do a good job in the drainage of tobacco fields. In short, it is necessary to reasonably drain and discharge the tobacco leaf according to its production period and environmental conditions to ensure the demand for tobacco leaf growth, so as to effectively increase tobacco leaf yield and quality. Heyin Clove,Cloves From Brazil,Natural Grade Cloves,Premium Grade Cloves Zhejiang Shanying Trading Co.,Ltd. , https://www.shanyingtrading.com