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在群体水培条件下,以汕优63为供试材料,于生育前、中、后期设计不同氮素供应水平(18个处理),研究其对根原基分化数、不定根数、根重及其根系活力的影响。结果表明:(1)生育前期的单株根重随着氮素供应水平的提高而增加,10、13、14、15叶龄期的单株根重与不定根数均呈极显著正相关,与每条不定根重无显著相关,(2)主茎第10叶节的根原基分化数与10叶期的植株含氮率呈正相关(r=0.978~(**)),第10叶节根原基的发根率与13叶期的植株含氮率呈负相关(r=-0.969~(**)),与可溶性糖、非可溶性糖均呈正相关(r=0.784~(NS),r=0.946~(**)),(3)生育中期短期(12日)内增加氮素供应水平可提高根重,处理时间过长(21日以上)则使根重尤其是上层根重下降;但增加氮素供应水平可提高单位根重的活力;(4)生育后期氮素供应水平对单株根重影响很小,且因稻体内含氮水平不同而异。生育中期供氮水平低或适宜时,生育后期适量施氮则可明显提高根系活力,生育中期供氮水平过高时,生育后期施氮则不能提高根系活力。
Under the condition of population hydroponics, different nitrogen supply levels (18 treatments) were designed before, during and after the birth with Shanyou 63 as test material, and their effects on root primordium differentiation number, adventitious root number, root weight and their Effects of root vitality. The results showed that: (1) The root weight per plant increased with the increase of nitrogen supply in the early growth period. There was a significant positive correlation between the root weight per plant and the number of adventitious roots in 10, 13, There was no significant correlation between the rooting weight and the rooting weight of each root. (2) There was a positive correlation between the root primordium differentiation number at the 10th leaf of the main stem and the nitrogen content of the plant at the 10th leaf stage (r = 0.978 ~ (**)), (R = -0.969 ~ (**)), and had positive correlation with soluble sugar and non-soluble sugar (r = 0.784 ~ (r = 0.944 ~ (**)). (3) Increasing the nitrogen supply in the short-term (12 days) of the second growth stage could increase the root weight, while the longer treatment time (over 21 days) decreased the root weight, especially the upper root weight; Nitrogen supply increased the vigor of root weight per unit of plant weight. (4) Nitrogen supply in late growth period had little effect on the root weight per plant, and varied with the level of nitrogen in rice. When the level of nitrogen supply was low or appropriate in the middle stage of fertility, the nitrogen application at the later stage of fertility could obviously increase the root activity. When the level of nitrogen supply was too high in the middle stage of fertility, the nitrogen fertilization at the later stage of growth could not increase the root activity.