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根颈粗是油菜壮秧的主要标志。据我们几年的观察,一般根颈粗与绿叶数、叶面积成正比,根颈粗的叶多、叶大。根颈和叶都有贮存养料的功能。但移栽后一般下部二张最大的叶片要枯掉,而根颈则很少受到影响。据78年考查4块稻板田资料,11月5～10日移栽,绿叶数5.59张,叶面积462.6平方厘米,根颈粗0.75厘米。11月23日考查,原叶片减少1.94张,叶面积减少57.3%;根颈粗不变,从而保证了养分的供应。(一)根颈粗与地下部分增长的关系根颈越粗,地下各部分增长量越大,见表1。在越冬期间,根颈越粗,地下部分增长也越多。
Root neck coarse is the main symbol of strong seedling rape. According to our observations of several years, the general root and neck coarse and green leaf number, leaf area is proportional to the root of the neck thick leaves, leaves large. Root neck and leaves have the function of storage nourishment. However, after transplanting, the two largest leaves in the lower part of the tree are usually wilted, while the root neck is seldom affected. According to 78 years of test 4 paddy field data, November 5 to 10 transplanting, the number of green leaves 5.59, leaf area 462.6 square centimeters, root neck 0.75 cm thick. November 23 examination, reducing the original leaf 1.94, 57.3% reduction in leaf area; root neck coarse, thus ensuring the supply of nutrients. (A) the root of the relationship between the thick and underground parts of the growth of the root neck, the more coarse, the greater the growth of various parts of the underground, see Table 1. During winter, the root neck is thicker and the underground part grows more.