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通过两年田间试验,研究了在玉米-大豆套作模式下,6月15日(A1,适期播种)、6月25日(A2,适当晚播)、7月5日(A3,晚播)3个播期和8.25万株·hm-2(B1)、11.25万株·hm-2(B2)、14.25万株·hm-2(B3)、17.25万株·hm-2(B4)4个密度对大豆植株性状、干物质积累及产量的影响。结果表明:A2较适期播种A1处理,花后单株干物质积累、茎粗和株高均降低,但花后群体干物质积累、花后作物生长率、荚果分配比率以及单株粒数均增加;在三种播期下,适度密植B3使大豆花后群体干物质重、作物生长率及荚果分配比率增加,在适当晚播A2的条件下表现更明显。在适当密植B3条件下,大豆适当晚播有利于大豆产量的提高,A2B3比A1B3平均提高了6.8%。
Through two years of field experiments, the effects of maize-soybean intercropping on June 15 (A1, sowing), June 25 (A2, late sowing), July 5 (A3, late sowing) ) 3 sowing dates and 82500 plants · hm-2 (B1), 112500 plants · hm-2 (B2), 142 500 plants · hm-2 (B3), 172 500 plants · hm-2 (B4) 4 Effect of Different Density on Plant Characters, Dry Matter Accumulation and Yield of. The results showed that: A2 was more suitable for sowing A1, the dry matter accumulation, stem diameter and plant height of anthesis decreased after anthesis, but the dry matter accumulation of anthesis group, post-anthesis crop growth rate, pod distribution ratio and grain number per plant . Under the three sowing dates, moderately-dense planting B3 enhanced the dry matter weight, crop growth rate and pod distribution ratio of the post-flowering population, which was more obvious under the suitable late-sowing A2 condition. Properly sowing of soybean at the appropriate planting density B3 was beneficial to the increase of soybean yield, while A2B3 increased by 6.8% on average than A1B3.