杂交制种,喷施“九二0”是获得高产的必要措施。目前“九二0”亩用量已高达10余克,每克价约3元,一亩制种田即需30元。如何减少“九二0”用量而又能保持较高的制种产量?是一个深受人们注意的问题。浙江农业大学研制的“九二0”增效剂,使用结果是有效的。每亩一瓶“九二0”增效剂(约3.5元),可以减少1/3～1/2“九二0”的用量。从理论上讲,延长“九二0”在茎叶上停留时间,是充分发挥“九二0”药效和减少“九二0”用量的关键。在稻株不缺素、营养良好的条件下,使用浙农大产的“九二0”增效剂,可以减少“九二0”用量。我们推测是粘着力强而末被流失所致。基于这种分 Hybrid seed, spray “92 20” is necessary to obtain high yield measures. At present, “92 2” mu amount has been as high as 10 grams per kilogram price of about 3 yuan, an acre of farming that is 30 yuan. How to reduce the amount of “920” while maintaining a high seed production? It is a matter that attracts people’s attention. Zhejiang Agricultural University developed “92” synergist, the results are valid. A bottle of “9,20” synergist (about 3.5 yuan) per mu can reduce the dosage of 1/3 to 1/2 “9220”. In theory, prolonging the stay time of “September 20” on the stems and leaves is the key to giving full play to the “920” efficacy and reducing the “920” dosage. In the rice plant is not lack of nutrients, good nutrition conditions, the use of Zhejiang agricultural production of “92 20” synergist, can reduce the “920” dosage. We speculate that the adhesion is strong and the end was caused by the loss. Based on this score