中国农业科学Issue(12)：2477-2485,9.DOI:10.3864/j.issn.0578-1752.2014.12.020
浅层施肥对水稻苗期根系生长及分布的影响
Effects of Fertilizer in Shallow Soils on Growth and Distribution of Rice Roots at Seedling Stage
摘要
Abstract
Objective] The aim of the research was to study the effects of different fertilization depths on growth and distribution of rice roots at seedling stage, and to ascertain the importance of fertilizer in shallow soils on the rice growth and thus providing information for appropriate fertilization. [Method] The trial was performed at the experimental base of Huazhong Agricultural University. Five treatments were designed, which were no fertilizer and fertilization depths of 1 cm, 5 cm, 10 cm, and 15 cm. According to the growth period of rice, samples were taken on 10, 20, 30 and 40 d after sowing. Several parameters were tested, including root biomasses, morphological index parameters, absorbing surface area and shoot biomasses of rice to assess the effect of different fertilization depths on rice seedling growth.[Result] The results showed that no significant differences were observed among treatments on 10 d after sowing The root biomass, morphological index parameters and absorbing surface area of 1 cm treatment were significantly higher than those of others on 20 d after sowing. The increment effects were 1 cm>5 cm, 10 cm, 15 cm>CK, and the shoot biomass had same tendency. The biomasses of rice root and shoot of 1 cm treatment were increased by 163.8%and 121.5%compared to those of 5 cm treatment on 30 d after sowing. The shoot biomasses differed among the treatments, the order of which was 1 cm>5 cm>10 cm, 15 cm>CK, and that of 1 cm treatment were 37.6%and 34.6%higher than those of 10 cm and 15 cm treatment, respectively on 40 d after sowing. Additional y, the results of root distribution indicated that 60%of rice roots concentrated in the 0-10 cm soil layer on 40 d after sowing. The root biomass of each soil layer in the fertilization treatments was higher than that of no fertilization treatment. The lower root biomasses of 1 cm treatment were significantly increased, which was 26.1% and 84.0% higher than other treatments in the 10-15 cm and 15-20 cm soil layers, respectively. [Conclusion] Different fertilization depths had impacts on the root growth and distribution of rice at seedling stage. During the whole growth period, the root biomass, morphological index parameters and absorbing surface area in 1 cm treatment showed significant advantages compared to other treatments. The 1 cm treatment could improve the root activity, increase the proportion of the lower root and benefit of the root architecture building. In the early rice growth period, the method of appropriate fertilization in shallow soils could significantly promote root growth. The shoot biomass of shallow soil fertilization was more than other treatments, which also responded to the well root growth and distribution of rice.关键词
浅层施肥/水稻/苗期/根系生长分布Key words
fertilizer in shallow soils/rice/seedling stage/root growth and distribution引用本文复制引用
孙浩燕,李小坤,任涛,丛日环,鲁剑巍..浅层施肥对水稻苗期根系生长及分布的影响[J].中国农业科学,2014,(12):2477-2485,9.基金项目
国家公益性行业（农业）科研专项（201303103）、中央高校基本科研业务费专项（2013PY113）、长江学者和创新团队发展计划 （）
