论文部分内容阅读
拔节期是小麦生长的一个重要转折关头。拔节以前小麦处于苗期,是营养生长为主的阶段,拔节以后转入到营养生长和生殖生长并重阶段,除了幼穗迅猛增大外,地面上5—6个节间及最后3片大叶相继伸展。其主要生长特点:一是,小麦拔节前约一周左右,分蘖达到了最高峰,以后向两极分化,大的成穗,小的被淘汰。如果这个时期水肥充足,就能够把一部分可能淘汰的分蘖拉向成穗的方面。二是,拔节以后,幼穗迅猛增大,大约每3—5天重量要翻一番。三是,拔节以后最后的三片大叶子逐次展开,这三片叶子的面积大约要相当于主茎上全部叶片总面积的60%以上。这三片叶子的大小和穗子的大小关系很大,一般是叶大穗大。四是,小麦一生每亩地约耗水300—450方,70%以上消耗在拔节以后的75天左右时间内,因此,中后期合理灌溉是非常重要的。五是,小麦植株
Jointing is an important turning point in the growth of wheat. Before jointing, wheat is in the seedling stage, which is the stage of vegetative growth. After jointing, the wheat is transferred to the vegetative and reproductive growth stage. In addition to the rapid increase of panicle, the 5-6 internodes and the last 3 large leaves Have to stretch. The main growth characteristics: First, about one week before jointing, tillering reached the peak, after the polarization, large into ear, small being eliminated. If sufficient water and fertilizer were available during this period, some of the tillers that could be eliminated could be pulled toward the ear. Second, after jointing, the panicle rapidly increases, doubling the weight every 3-5 days. Third, the last three large leaves after jointing unfold one after another, and the area of the three leaves is equivalent to about 60% of the total area of all the leaves of the main stem. The size of the three leaves and the size of the ears of a great relationship, generally large leaves big spike. Fourth, wheat per acre of land about 300-450 square feet of water consumption, more than 70% of consumption in the 75 days after jointing within the time, therefore, in the latter part of the rational irrigation is very important. Fifth, wheat plants