High quality and high yield of vegetables should pay attention to calcium

Vegetables are hi calcium crops. People often pay attention to the application of nitrogen, phosphorus and potassium fertilizers when planting, and most of them do not pay attention to the application of calcium fertilizers. With the emergence of a large number of facility cultivation, it is more likely to cause calcium deficiency in greenhouse soil. According to experiments, when producing greenhouse vegetables, reasonable application of calcium fertilizer can generally increase production by 10%-20%. The application of calcium fertilizer to vegetables can increase the calcium content of the plant, maintain the appearance of bright color for a long time, and obviously improve the appearance quality and intrinsic quality. In addition, calcium deficiency is an important cause of illness and rot in many vegetables. Rich in calcium, potassium vegetables, strong disease resistance, easy to store, so vegetables can be given in one go.

The cause of calcium deficiency

The low content of available calcium in the soil can not meet the needs of vegetables for calcium; the high content of salt in the soil inhibits the absorption of water and calcium by the root system, especially in strong acid red soil and yellow loam soil, because of strong acidity, it affects Absorption of calcium; excessive concentration of soil solution, or the presence of large amounts of ammonium nitrogen will impede the absorption of calcium; soil plough layer is shallow, especially sand soil has poor water retention and fertility, and calcium loss is large; nitrogen fertilizer is applied in large quantities Under the circumstances, excessive nitrogen fertilizer will reduce the effectiveness of soil calcium. At the same time, calcium moves slowly in the plant. Therefore, the nutritional problem of calcium deficiency in vegetables has become a prominent issue in cultivation.

The calcium deficiency of vegetables, generally young leaves and young tissues, fruit calcium easily. The symptoms are as follows: the newly emerged parts of the plant, such as the apical buds and root hairs, are stagnant and atrophied; the new leaves are stuck, and most of them are unable to expand normally; the new leaves that are unfolded often have coke edges and are incomplete; the plants are short and soft, and the internodes are shortened; Depression, dark brown necrosis; growth point necrosis when severe calcium deficiency.

Vegetable crops supplement calcium fertilizer

The first is to reasonably select calcium fertilizer varieties. Different calcium fertilizers have different properties. The soil pH in the greenhouse is mostly 6.5-7.5. Alkaline substances or neutral fertilizers such as hydrated lime and calcium nitrate should be used. With acidic or physiological acidic substances, lime nitrogen and other fertilizers contain calcium nutrients, common phosphorus fertilizers such as superphosphate, calcium magnesium phosphate, heavy calcium superphosphate is also an important source of calcium fertilizer. Bone meal, grass and wood ash all contain a certain amount of calcium, which is also a source of calcium that cannot be ignored. It can be selected according to the situation. The second is the period of fertilization. After the vegetable grows into a prosperous period, the soil calcium nutrition begins to decrease, and the calcium in the leaf begins to decrease. At this time, the calcium fertilizer is the best period. Therefore, in the production of calcium deficiency in the early stage to prevent the growth of vegetables, basic application can be adopted. In the greenhouses that have been planted for many years, generally 2000-3000 kg of decomposed organic fertilizer is applied to Mushi and 30-45 kg of superphosphate is added. The third method is fertilization. For heavier exposed or greenhouse vegetables, the method of reapplying basal fertilizer, ie, applying 100 kg of wood ash per acre or 50 kg of hydrated lime, can be used to regulate the pH of the soil. The specific approach is to spread the organic fertilizer with hydrated lime or ash, evenly applied to the surface of the ground and plowed into the ground. For vegetables in the growth period, especially after entering the vigorous growth period, the method of top dressing can be used to supplement calcium nutrition, generally 40-60 kilograms of slaked lime are used per acre, and the amount of lime used in sandy soil is appropriately reduced. Not only can calcium supplement, but also conducive to neutralize the acidity of the soil, increase the pH, improve the structure of the soil pellets, can also 80 kg of hydrated lime or 50 kg of ash, uncover the end of the membrane, ditch depth 10 cm, topdressing the fertilizer After watering the bottom of the trench, cover the membrane with the earth under the infiltration. Or deep plowing and the use of plastic film cover cultivation methods to enhance its ability to retain water and fertilizer, maintain relatively stable soil moisture, reduce calcium loss. Can also be combined with disease-prevention spray using leaf top dressing calcium supplement, top dressing concentration is generally 0.3% -0.5% is appropriate. Generally can be sprayed with 0.1% -0.2% of calcium nitrate or 1% of superphosphate, every 15 days or so, even spray 3-4 times, the effect is better.

Tof(Time-of-flight), is JRT new product, which is a single-point LiDAR sensor. With a micro size of 46x17x7mm, customers can widely use in many Laser Measurement Solutions. The lidar distance sensor can measure 12m short-range. It's great for Unmanned Aerial Systems.Contact Us Now for data sheet.

Tof LiDAR Sensor

ToF Sensor,Time of Flight Sensor,LiDAR Distance Sensor,ToF Distance Sensor

Chengdu JRT Meter Technology Co., Ltd , https://www.cdtoflidarsensor.com