Rice seedlings using paclobutrazol five notes

July 24, 2019

The use of paclobutrazol in rice seedlings has obvious effects such as dwarfing and sturdy growth, early-onset growth, increased resistance, disease-resistance and grass-inhibiting effects, and increased yield and income. However, in the course of use, it often appears that due to improper use, resulting in over-dwarf seedlings, growth stagnation or even death, late mature greed and other adverse consequences. In order to avoid this happening, based on the experience of experiments and production in the past several years, the following five points must be taken into consideration when using paclobutrazol in rice seedlings:

1, the dose should be suitable for different varieties, different seasons, paclobutrazol spray concentration is not the same, when used, the dose should not be too large or too small. If the dose is too large, the seedlings will be too dwarfed; if they are too small, the effect of strong stunts will be insignificant. Practice has shown that commonly used doses of seedlings (15% wettable powder are used as an example): 120 grams per 667 square meters (1 acre) for early rice fields, 60 kg for water; 200 grams per 667 square meters for late rice fields, 100 for water Kilograms; mid-season Putian early maturing varieties use 150 grams per 667 square meters, 75 kilograms of water, and 180 grams of late-maturing varieties use 90 kilograms of water. Use a uniform spray. If the stagnation is caused by a large concentration, a “10-2” concentration of “920” can be sprayed to promote the normal growth of the seedlings.

2. The use of paclobutrazol is not the only way to use it in different seasons. Due to the low temperature and the slow growth of seedlings during early rice breeding, the purpose of using paclobutrazol is to strengthen the seedlings and increase their resistance. The application period is generally suitable for the three-leaf period. The use of paclobutrazol in late rice is not only controlling long but also promoting pupa. The appropriate period of use should be at the end of one leaf and one leaf at the heart of the seedling, and no more than two leaf and one heart at the latest. Mid-season rice crops have a flexible climate, and generally early-maturing varieties are applied at the 2-3 leaf stage and late-maturing varieties are applied at the one-leaf and one-heart stage.

3, field management to grasp the early seedlings spraying paclobutrazol, transplanting Datian has the characteristics of returning to fast green, early-onset fast, so Daejeon field management should be accordingly "three early", namely early management, early, early control seedlings Generally, the time for storing (baking) the field can be 2-3 days earlier. Avoid delaying (bake) the field too late but too much greed seedlings, resulting in increased pests and diseases, increased empty grains, reduced grain weight, lodging and so on.

4, to guard against late-maturing rice spraying paclobutrazol, the whole growth period has a delayed trend, pay attention to the arrangement of the upper and lower seeding period and due to some problems brought about by the late. The key to preventing late maturity is to sow the sowing date 2-3 days earlier.

5. It is necessary to pay attention to the residual virus. Because paclobutrazol is slow to move in the soil and difficult to decompose, if you use paclobutrazol for multiple times or consecutive years in the same field, or if you use the paclobutrazol, you may plant the post-cultivation crop without plowing. Excessive amounts of paclobutrazol resulted in re-control of post-crop crops, affecting normal growth of post-crop crops. In this regard, we must pay attention to the use of doses and do a good job selection, try to avoid using the same plot of land for many years or multiple use of paclobutrazol.

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