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棉花(陆地棉)植株的生长和同化产物在营养体与生殖器官之间的分配都强烈地受到根带体积的影响。生长在小盆中的植株,由于根系受到限制,从而引起营养生长在相当程度上的减退,並导致生殖器官干重的比率增加。经用容量为2、5、10或25升的塑料盆来限制根带体积的试验表明:营养体的生长即枝条的重量和茎的长度,与根带体积的增长成正相关;当枝条生长减弱时,籽棉的干重与营养体的比率就增加。限制根系的生长则导致植株的节间短,叶片少,而棉铃干重与营养体的比率增高,这样的植株在密植中可以有利于棉花产量的增加。在对枝梢含N、P和K的分析中以及在对叶片的水势和气孔的抗逆性的测定中,都表明生长在不同根带体积的植株之间没有显著差异。因此,可以推断,不同的生长比率并不主要是由于N、P和K的差异以及水分的缺乏所引起的,而是由于不同的盆容量影响根系的发育所致。
The growth of cotton (Upland cotton) plants and the distribution of assimilates between vegetative and reproductive organs are strongly influenced by the root zone volume. Plants grown in small pots, due to the limited root system, cause a considerable loss of vegetative growth and lead to an increase in the ratio of reproductive organ dry weight. Experiments that restrict the root zone volume by plastic basins with capacities of 2, 5, 10, or 25 liters show that vegetative growth, ie, shoot weight and stem length, is positively correlated with root zone volume growth; When the seed cotton dry weight and nutrient ratio increased. Restricting the growth of the root causes the internodes of the plants to be short, the leaves less, and the ratio of the dry weight of boll to the vegetative body is increased. Such plants can benefit the cotton yield increase in close planting. In the analysis of shoots containing N, P and K and in the determination of leaf blade water potential and stomatal resistance, there was no significant difference between the plants grown on different root zone volumes. Therefore, it can be inferred that different growth rates are not mainly due to the differences in N, P and K and the lack of water, but rather due to the different pot capacities affecting root development.