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1、大豆花期喷药技术 大豆从花蕾膨大到花朵开放,需3～4天,每天上午6时开始开花,8～10时开花最多,约占87％,下午4时后开花很少。风天开花提早,阴雨连绵时开花推迟。大豆开花时期对外界不良影响抵抗力弱,此时喷药,会杀伤花粉、伤害柱头,造成畸形,使花荚脱落,秕粒增多。据有关试验证明,大豆开花期喷施农药可减产10％左右。因此,大豆花期发生病虫害非喷施农药不可时要慎重行事。(1)把握喷药时间。一定要在下午
1, Soybean flowering technology Soybean bloomed from bud to flower opening, take 3 to 4 days, beginning at 6:00 am every day flowering, 8 to 10 when the flowering up, accounting for about 87%, after 4 pm flowering rarely. Windy flowering early, flowering delayed rainy time. Soybean flowering period of the adverse effects on the outside world resistance is weak, this time spraying, will kill pollen, stigma, causing deformity, flower pods fall off, nausea increased. According to the test proved that the flowering of soybean pesticides can be reduced by about 10%. Therefore, the occurrence of pests and diseases during the flowering of soybean non-spray pesticide should be cautious. (1) grasp the spraying time. Must be in the afternoon