长期化肥和有机肥施用对双季稻根茬生物量及养分积累特征的影响

doi:10.3864/j.issn.0578-1752.2017.18.010

Abstract

Abstract: 【Objective】 Rice root returned to soil not only promotes mineral nutrients returned to soil, but also improves soil fertility. However, little information is reported about the root biomass and root nutrients accumulation. 【Method】 Based on the long-term field experiment started from 1981, four treatments were chosen, (1) no fertilizer treatment (CK), (2) nitrogen (N), phosphorus (P) and potassium (K) fertilizers (NPK), (3) Double rates of NPK fertilizers (2NPK), (4) NPK + manure (NPKOM). The soil and plant were sampled and measured in 2012. The changes of rice root biomass and their N, P, K contents were analyzed, then, the response of soil fertility factor to root were explored. 【Result】 Rice root biomass, nutrient accumulation and their proportions in whole plant were shown that early rice was significantly higher than that of late rice among all treatments, meanwhile, application of chemical and organic fertilizers increased significantly root biomass and nutrient accumulation in both rice growing seasons than other treatments. Compared with NPK, the root biomass and N, P and K accumulation in early rice growing season increased by 20.58%, 17.34%, 270.66% and 37.89%, respectively; and correspondingly the values in later rice season were 23.85%, 17.88%, 262.55% and 37.96%, respectively. However, compared with early rice, the proportions of root biomass, N and K accumulation in whole plant in NPKOM treatment in the late rice growing season decreased by 22.18%, 33.90% and 26.70%, respectively; and correspondingly the values in NPK treatment were 4.91%, 39.41% and 27.06%, respectively. Conversely, the proportions of root P accumulation in whole plant in NPKOM treatment in late rice growing season showed an increase tread in comparing with early rice growing season. Further, its multivariate regression analysis showed that soil total P and available P contents were key factors in the increase of rice root biomass and the accumulation of N, P, K in root. 【Conclusion】 Long-term application of organic and inorganic fertilizers increased rice root biomass and nutrient accumulation, but decreased the proportions of rice root N and K accumulation in whole plant. Moreover, soil P content played an important role in rice root growth and nutrient accumulation.

Key words: root biomass, nutrient accumulation, soil fertility, double rice system, long-term field experiment, chemical fertilizer, organic fertilizer

LIU KaiLou, ZHANG HuiMin, HAN TianFu, ZHOU LiJun, LI DaMing, HU ZhiHua, HUANG QingHai, YE HuiCai, XU XiaoLin, HU HuiWen. Effects of Long-Term Application of Chemical and Organic Fertilizers on Root Biomass and Nutrient in Double Cropping Rice System[J].Scientia Agricultura Sinica, 2017, 50(18): 3540-3547.

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Effects of Long-Term Application of Chemical and Organic Fertilizers on Root Biomass and Nutrient in Double Cropping Rice System

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