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建国以来,经过各级领导和广大农业科技工作者的共同努力,我省小麦种植先后完成了六次更换1=作。根据一至六次更换的理论和实践,研究每次更换的内在联系和发展,小麦品种更换具有下述基本特点: l、植株变矮:植株由高矮,茎杆由细变粗,穗变大,株型趋于紧凑。株高降到70—90cm,茎粗由4rm以下增至4.5lm以上。 2、产量结构趋向协调:表现为亩穗数增加,千粒重由小变大,穗粒数由少变多。亩穗数由每亩10多万增加到40万左右,穗粒数由20多粒增至40粒左右,千粒重由30克增至40克左右。 3、品种综合病能力相对稳定:表现为抗锈病的能力不断增强,对自粉病抵抗力有所下降,受产量水平、生产条件的改变,发病频率增高。
Since the founding of the People’s Republic, thanks to the joint efforts of leaders at all levels and vast numbers of agricultural scientists and technicians, the wheat planting in our province has successively completed six replacement 1 = operations. According to the theory and practice of one to six replacement, to study the internal connection and development of each replacement, the change of wheat varieties has the following basic features: l, the plants become shorter: the height of the plants, the stems from thin to coarse, Plant type tends to compact. Plant height dropped to 70-90cm, stem diameter from 4rm to 4.5lm above. 2, the yield structure tends to coordinate: the performance for the increase in acres of panicles, grain weight from small to large, sparse grain number from less to more. The number of spikes per acre increased from about 100,000 to about 400,000, the number of grains per spike increased from 20 to 40, and the weight of thousand grains increased from 30 to 40 grams. 3, the variety of comprehensive disease capacity is relatively stable: the performance of the ability to resist rust continued to increase resistance to powdery mildew decreased resistance by the level of production, production conditions change, the incidence increased.