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(一)高粱的适宜播种深度因品种、播种时期、土壤湿度及土壤質地之不同而有所不同。淮南丘陵地区,春播因雨水較多,寒高粱以播三至五厘米深为宜,多穗高粱以三厘米深为宜;夏播雨水較少,寒高粱以播深五至七厘米宜,多穗高粱可在五厘米左右。(二)高粱的品种类型不同,出苗能力也有所不同。普通高粱(寒高粱),根茎伸长幅度較大,出苗能力强,多穗高粱根茎伸长幅度小,出苗能力弱。(三)根茎的伸长是高粱的适应性。黑暗的条件有利于根茎的伸长,生长中心的轉移是根茎停止伸长的原因,光照对根茎伸长的抑制作用是間接的。第一片真叶出現的迟早和根茎伸长的停止有一定的关系,多穗高粱第一片真叶出現早,引起生长中心轉向叶的生长也相应提早,而使根茎伸长停止。(四)芽鞘的长度决定于品种的特性,外界条件对其影响較小,不过一般說,黑暗条件有利于芽鞘較小幅度的伸长,光照能抑制芽鞘徒长,而不能阻止其正常生长。(五)根茎和胚根的伸长,具有显著地負相关性。播种太深时,由于胚乳过多的消耗于根茎的伸长,胚根发育不良,而不利于幼苗生长。
(A) The suitable sowing depth of sorghum varies according to variety, planting time, soil moisture and soil texture. Huainan hilly areas, spring sowing more due to rain, cold sorghum to sow three to five centimeters deep is appropriate, more than three centimeters deep sorghum suitable; summer sowing less water, cold sorghum to sow the depth of five to seven centimeters should be, and more Spike sorghum can be about five centimeters. (B) different types of sorghum, the emergence of different ability. Ordinary sorghum (cold sorghum), rhizome elongation larger, strong emergence ability, multi-spike sorghum rhizome elongation is small, the emergence of weak. (C) rhizome elongation is sorghum adaptability. The dark conditions are conducive to the elongation of rhizomes. The transfer of growth centers is the reason why rhizomes stop elongation. The inhibition of light on rhizome elongation is indirect. Sooner or later, the first true leaf appears to have a certain relationship with the stop of rhizome elongation. The first true leaf of multi-spike sorghum appeared early and the growth of turning leaf in growth center was correspondingly earlier, and the elongation of rhizome stopped. (D) the length of the sheath of the sheath depends on the characteristics of varieties, the external conditions have little effect on it, but generally speaking, dark conditions conducive to bud sheath a small elongation, light can inhibit bud sheath long, but can not stop its normal Grow. (E) The elongation of rhizomes and radicles was significantly negatively correlated. Sowing too deep, due to endosperm excessive consumption of rhizome elongation, radicle dysplasia, but not conducive to seedling growth.