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1 选早熟种。在河北省宜选择耐旱、开花早、花期集中、小粒品种为宜。如冀豆、早丰一号、晋豆3号等优种。 2 早做播前准备。夏播大豆,没有充分时间整地施肥,所以在小麦收获前要有计划多施一些肥料,做到一季施肥两季用。并浇好麦黄水。若墒情好,但底肥不足,上茬收后可667m~2用40kg碳铵配合50kg普钙撒施地表,然后用旋耕犁浅耠,最后耙耱整平,底墒不太足者可采用贴花播种。 3 抢时早播。早播是夺取丰产前提。据试验,以6月30日为准,每延迟一周下种减产24％,延迟半月减少40％。因而在适宜条件下,应尽可能早
1 election precocious species. Should choose drought-resistant in Hebei Province, early flowering, flowering focus, small grains is appropriate. Such as Ji beans, early Feng, Jin Dou No. 3 and other superior. 2 early to prepare before sowing. Sowing summer, there is no sufficient time for land preparation and fertilization, so before the wheat harvest there are plans to apply more fertilizer to achieve a quarter with two seasons of fertilizer. And pour the wheat yellow water. If the moisture is good, but the lack of base fertilizer, after the harvest can be 667m ~ 2 with 40kg ammonium bicarbonate with 50kg of calcium applied to the surface, and then use a rotary plow shallow 最, the last rake 耱 leveling, the end of the soil moisture may be less applique sowing. 3 grab the early broadcast. Early seeding is to seize the premise of high yield. According to the test, June 30, whichever is later, will reduce the output by 24% in one week delay and 40% in the delay half-moon. Therefore, under suitable conditions, it should be as early as possible