Tomato pupate hard fruit is small in size and fruit shape is not correct, the surface of the block-like cork brown spots, in severe cases, plaques connect into large pieces, and produce varying depths of cracks, the diseased part of the skin becomes hard. Cause of the disease: mainly caused by boron deficiency in plants. Acidification of soil, excessive leaching of boron, or application of excessive lime, are all likely to cause boron deficiency; soil drought, organic fertilizer application is also less likely to lead to boron deficiency; excessive application of potassium fertilizer, can inhibit the absorption of boron; plant under high temperature conditions Accelerated growth, due to poor mobility of boron in the plant body, often can not be timely and fully allocated to the urgently needed parts, will also cause partial lack of boron plant. Prevention and control methods: Application of boron fertilizer, soil boron deficiency, should be appropriate in the base fertilizer containing boron fertilizer. When symptoms of boron deficiency occur, foliar spray of 0.1% to 0.2% borax solution should be promptly applied, and spray should be applied 7 to 10 days, with 2 to 3 sprays. With the addition of organic fertilizers, the nutrients in organic fertilizers are relatively complete, with the use of decomposed manure fertilizers, and the use of barium in manure fertilizers to increase fertility, enhance soil water retention capacity, relieve drought, promote root extension, and promote plant growth to boron. absorb. To improve the soil, it is necessary to prevent the acidification or alkalization of the soil in the protected area. Once the soil is acidified or alkalized, it needs to be modified to adjust the soil pH to neutral or slightly acidic. Reasonable irrigation ensures the water supply of the plants and prevents the soil from becoming dry or too wet, otherwise it will affect the absorption of boron by the roots. Dried Seafood,Dried Squid,Dried Scallops,Dried Shrimp Shandong Haizhibao Ocean Science and Technology Co.,Ltd. , https://www.haizhibaoseafood.com