According to the characteristics of fertilizer demand in different growth stages of watermelon, the correct topdressing can not only meet the needs of various nutrients during the growth period of watermelon, improve its quality and yield, but also improve the utilization rate of fertilizer. On the basis of applying the base fertilizer, it is generally necessary to chase three fertilizers.
First, light application of seedlings
After planting and slowing down the seedlings , or in the 4 to 5 leaf stage of the live broadcast, open the arc-shaped ditch at a distance of 10 to 15 cm from the root , apply 5 kg of urea per acre , preferably with 0.5% solution, and cover the soil cover after infiltration. level. For the weak seedlings, the "eccentric" fertilizer can be appropriately added. Seedling stage topdressing should not be too much, too close to the roots, so as not to damage the roots and form a dead seedling.
Second, clever application of vine
After the plants are stretched, the growth rate is faster and the demand for nutrients is increasing. Therefore, it is necessary to increase the amount of topdressing to meet the growth needs. It is best to use high-quality organic fertilizer such as cake fertilizer and large manure. 50 to 100 grams of cake per plant . Or apply 15 kg of ternary compound fertilizer per acre . When the vine is about 30 cm long , the shallow ditch of about 10 cm is applied to the side of the scorpion, and the soil is watered after the soil is covered. For melons with high soil fertility, sufficient base fertilizer and strong seedlings, the amount of topdressing should be reduced or not applied, because at this time, too much fertilizer and water can cause long-term growth and affect the sitting. This fertilization can not only promote the growth of watermelon stems and leaves, but also solve the nutritional needs of the melons, which is beneficial to maintain the growth of the plants and prolong the melon period.
Third, heavy application of expanded melon
After the watermelon sits on the melon, it enters the period of expanding the melon. At this time, the watermelon needs the most fertilizer. In this period, the top dressing can promote the rapid expansion of the fruit, which is called the expanded melon. Generally, it is applied twice, with phosphorus and potassium fertilizers as the mainstay, combined with nitrogen fertilizer.
The first top dressing Yougua egg size, Mushi fertilizer with 20 to 25 kg, 5 to 6 kg urea, diammonium phosphate, or 15 to 20 kg, 15 kg of potassium sulfate; melon sized when the second size, The application of diammonium phosphate is 5 to 7.5 kg, and potassium sulfate is 2 to 3 kg. As a result, the melons have been sealed, and it is easy to damage the stems and leaves by ditching or opening a hole. Fertilization should be carried out immediately after water application or spraying.
In addition, the results can be followed by root dressing according to the needs, generally can be sprayed with l ~ 1.5% of superphosphate leaching solution, can also be mixed with 0.5% urea and dimethoate, methyl thiophanate, can play very good effect.
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JIS B2220 Flanges specifies steel pipe flanges (hereafter referred to as "flanges")of nominal sizes 10 A to 1500 A for nominal pressures 5K, 10K, 10K light type, 16K, 20K, 30K, 40K and 63K which are used to join parts for piping, such as steel pipes and valves used for ordinary piping pressure piping , high pressure piping , high temperature piping , alloy steel piping and stainless steel piping for steam, air, gas, water, oil, etc.
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