The use of paclobutrazol in rice seedlings has obvious effects such as dwarfing and sturdy, early-increasing panicle, enhancing resistance, preventing disease and inhibiting grass, increasing yield and increasing income. However, in the course of use, it is often caused by improper use, resulting in abnormal effects such as excessive dwarfing of seedlings, stagnant growth or even death, and late maturity. In order to avoid this situation, according to the experience of trials and production practices in recent years, the use of paclobutrazol in rice seedlings must pay attention to the following five points:

1. The dosage should be suitable for different varieties and different seasons. The spraying concentration of paclobutrazol is not the same. When used, the dosage should not be too large or too small. If the dose is too large, the seedlings are too controlled and dwarfed; if they are too small, the effect of the strong tendon is not obvious. Practice has shown that the usual doses of seedlings (both 15% wettable powders): 120 grams per 667 square meters (1 mu) in early rice field, 60 kg in water; 200 g per 667 square meters in late rice field, 100 water Kg; 150 mg of 667 square meters of early-maturing varieties of mid-season rice, 75 kg of water, 180 g of late-maturing variety, 90 kg of water. Use it as a uniform spray. If the concentration is too long, the stagnation may be applied, and the "920" concentration of 10-4 may be sprayed to promote the growth of the seedlings into normal growth.

2, the use of timely breeding seasons, the use of paclobutraz is also different. During the early rice growing period, due to the low temperature, the seedlings grow slowly. The purpose of using paclobutrazol is to strengthen the seedlings and enhance the resistance. The application period is generally three-leaf period. The use of paclobutrazol in late rice is both controlled and promoted. The period of use should be in the period of one leaf and one heart, and no later than the second leaf. The medium-sized rice is closely controlled by the climate and the climate. The early-maturing varieties are applied in the 2-3 leaf stage, and the late-maturing varieties are applied in the one-leaf and one-heart stage.

3, Tian Guan to catch early seedlings sprayed with paclobutrazol, transplanted field has the characteristics of fast greening, early and fast, therefore, the field management of Daejeon should be corresponding to "three early", that is, early tube, early promotion, early control seedlings Generally, the time for resting (roasting) can be 2-3 days earlier. It is forbidden to put (baked) fields too late and too much greedy seedlings, resulting in increased pests, increased empty mites, decreased grain weight, and lodging.

4, beware of delaying the application of paclobutrazol in late-maturing rice, the whole growth period has a tendency to postpone, pay attention to the arrangement of the upper and lower sputum sowing period and some problems caused by late maturity. The key to preventing late maturity is to make the sowing date 2-3 days earlier.

5. Attention should be paid to residual poisoning. Because paclobutrazol moves slowly and is not easy to decompose in the soil, if the paclobutraz is used several times a year or on the same plot, or if the poultry with auxilazole is planted without ploughing, it may be caused by Excessive paclobutrazol residues cause the subsequent crops to be controlled again, affecting the normal growth of the later crops. In this regard, it is necessary to pay attention to the use of dosage and do a good choice in the field, try to avoid the use of paclobutrazol in the same piece of the year or multiple times.

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