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目前生产上所采用的玉米杂交种,多属于一株结一个果穗的单穗类型。实践表明,优良的双穗型玉米杂交种,双穗率在90％以上,如果种植得法,夏播亩产可超千斤。为了充分发挥双穗玉米的增产潜力,除选用双穗率高,遗传性稳定的双穗型杂交种外,还必须辅以良法,使其优良特性能够充分表现出来,达到丰产。为了给良种良法配套提供依据,我们曾对双穗型玉米不同生长发育时期光合产物的运输和分配动态进行了研究并与单穗型玉米作比较,以便找出它们的规律。双穗型玉米我们选用的是“泰单75号”(单交种),单穗型玉米我们选用的是“烟三6号”
Currently used in production of corn hybrids, mostly belonging to a single ear of a single ear type. Practice shows that the excellent double-spike corn hybrids, double-spike rate of 90% or more, if planted in law, summer sowing per mu can be super-kilograms. In order to give full play to the yield potential of double-ear corn, in addition to the selection of double-spike rate, genetic stability of the double-spike hybrids, but also must be supplemented by good law, so that its excellent features can be fully demonstrated to achieve high yield. In order to provide a good basis for supporting good varieties, we have studied the dynamic changes of photosynthate transport and distribution during the different growth stages of double-tasted maize compared with single-tasted maize in order to find out their laws. Double-spike corn we use is “Thai No. 75” (single cross), single-spike corn we use the “Smoke No. 3”