论文部分内容阅读
耐旱性小麦属的起源地属于渐变的干燥气候,其进化进程当在干旱的条件下发生。所以小麦属的原始形态大部分是耐旱型。最早的栽培种并不需要较多的水分。但新的高产品种却需要供应相当多的水分以生产大量的干物质。在每公顷籽粒产量五公吨的情况下,所产生的茎、叶和穗的比例约为1.0—1.2,而与根的比例为0.15—0.35(Nosatovsky1959)。按成熟状态的含水量为15％计算,每公顷的干
Drought-resistant Wheat genus belongs to a gradual dry climate, the evolution of which occurs under drought conditions. Therefore, most of the original wheat genus is drought-tolerant. Oldest cultivars do not require much water. However, the new high-yielding varieties need to supply a considerable amount of water to produce large amounts of dry matter. At a yield of five metric tons per hectare, the ratio of stems, leaves and ears produced is about 1.0-1.2 and the ratio to roots is 0.15-0.35 (Nosatovsky 1959). According to the mature state of 15% moisture content, dry per hectare