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Effects of different fertilization on soil characteristics and growth of potato

Ye Xiuxiang;Liu Yajun;Li Yue;Ma Kun;School of Agriculture,Ningxia University;  
To study the effects of different fertilization on soil and crops and reveal the variation in soil fertilities. The growth of potato,yield and the change of the soil fertilities were studied by using three kind of fertilizer management in middle arid region of Ningxia. The results showed that leaf area index and biomass were significant increased with the potato growth and development. But the potato leaf area index and biomass in the treatment of the Chemical Fertilizer with sheep manure had an obviously increasing trend compared with other treatments. The proportion of soil fungi in the soil microbial communities were decreased, while bacteria and actinomycetes were increased under different fertilizer managements; the soil bacterial population were significantly increased about 26.05% after using chemical fertilizer and the amounts of actinomycetes were significantly improved by the Chemical Fertilizer with sheep manure compared with the control; the treatment of control also showed a higher number of fungi. Average well color development(AWCD) of the soil microbial community showed an s-shaped curve along with the increasing of incubation time, and it reach a maximum in 168 h, the soil microorganisms in treatment of chemical fertilizer and chemical fertilizer with sheep manure had a stronger ability in carbon source utilization. The potato yield is significantly higher than control, the potato yield under the chemical fertilizer with manure were increased by84.87% compared with the control. On the whole, the management of combination of organic and inorganic fertilizer showed a better effect on soil microbial community structure and function and had a greater contribution on production.
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