In summer, plant growth is a physiological phenomenon that occurs more often in crops. In order to understand the solution to this problem, the author interviewed Liu Enming, a villager of Liuguan Village in the Old Town Subdistrict Office of Shouguang City. He has extensive experience in vegetable cultivation.
One, seedlings growers.
The main reason for causing leggy seedlings is too high, especially when the nighttime temperature is too high, and it is more likely to occur when the respiratory consumption is excessive. In addition, nitrogen fertilizer and excessive water, sowing too dense, not timely transfer seedlings, etc., can easily lead to seedlings leggy.
There are different reasons why vegetables grow more and more in various periods during the summer: (1) Legislation is most likely to occur, and the period of serious damage is from emergence to cotyledon development. The legislators are mainly due to sowing, and they are not timely exposed after emergence. Remove the cover and make the seedlings too crowded. 2 After the emergence of the seedlings, the temperature did not cool down in time, and the epicotyls of the seedlings were also prone to overgrowth. 3 The cotyledon was expanded to the 2 to 3 leaf stage, and the seedlings did not occur at the same time, or because the temperature was too high and they were not planted in time (moving seedlings into the earthworms). 4 After planting the seedlings to the planting stage, due to the high soil and air humidity in the seedbeds, nitrogen fertilizers in the nutrient soils are too high, and the management of the seedlings that are not able to be ventilated, light and crowded and crowded in time can also lead to leggy.
The main methods to prevent seedlings from being leggy are: 1 The planting density should not be too large so as to avoid seedling crowding after emergence. At the same time, ground cover was removed in time after about 30% emergence. 2 and time seedlings, planting and colonization. Seedlings after emergence should be time and seedlings, generally should be 2 to 3 times between seedlings; in the seedlings, "two leaves and one heart" should be carried out when the planting, the density of the implants is controlled at 120 to 130 / square meter. 3 strengthen ventilation and light, control of temperature and humidity. After exhumation of the seedlings and before planting, after transplanting the seedlings and after planting, the ventilation and transparence should be carried out, the temperature and humidity should be reduced, and the cold exercise should be strengthened to control the overgrowth of the seedlings. 4 Rationalize fertilizer and water management. In the preparation of nutritious soil, attention should be paid to the amount of phosphorus and potash fertilizer and the amount of nitrogen fertilizer should be controlled. Strict control of moisture and topdressing in the seedbed requires topdressing nitrogen fertilizer when dressing is required. 5 Timely sparse seedlings. About 20 days before the planting of eggplant and melon, the over-crowding of the seedlings often occurs. At this time, the seedlings should be properly moved to separate the seedlings and the survival space of the individual plants. 6 drug control apprentice. In addition to the above-mentioned measures, the seedlings can be sprayed with 0.2% Bordeaux (equal) spray or with 50% Chlormequat 2000 to 2500 times.
Second, plant leggy
Causes of plant leggy also include factors such as temperature, humidity, excessive nitrogen fertilizer or excess nutrients. Solution:
1, less effective application of nitrogen fertilizer: a variety of crops in the cultivation process, especially the fruiting period of the melon, often due to excessive nitrogen fertilizer, resulting in growing over-wang, falling serious fruit drop, making nutrient excess growth, and reproductive growth is insufficient. Therefore, the application of nitrogen fertilizer is much less, the best choice of amino acid water fertilization; 2, nutrition regulation: According to humic acid foliar fertilizer, amino acid foliar fertilizer at a certain concentration can control the growth potential characteristics, combined with disease prevention and pest control, It is better than adding auxin and chlormezanone and other hormonal drugs, and it is pure and colory, with high yield; 3. Cut roots and cut roots: eggplant, pepper, cowpea, melon and other crops. When the plant grows too busy, it can take Method." On the one hand to increase soil permeability, on the other hand can make some of the roots off, is conducive to secondary roots under the bar; 4, small water pouring: meet the needs of the crop while reducing soil moisture; 5, shade net cooling.
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