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| Economic effects and coupling models of water and fertilizer of rice cultivated in aerobic soil |
| He Jinyu1, Tian Juncang1,2,3 |
| 1.College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China; 2.Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan, Ningxia 750021, China; 3.Engineering Research Center for Efficient Utilization of Water Resources in Modern Agriculture in Arid Regions, Yinchuan, Ningxia 750021, China |
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Abstract To probe the relations of water and fertilizer with the yield, the field experiment on the mo-del of water and fertilizer coupling of rice cultivated in aerobic soil by mulch drip irrigation was carried out by a current rotary combination design, and its application prospect was comparatively analyzed. The relation between irrigation quota, nitrogen, phosphorus and rice yields was in line with the ternary quadratic regression model under the tested soil by mulch drip irrigation. The regression coefficients of the first term, the second term and the water-nitrogen interaction term have extremely significant level. The roles of increasing yields of the three factors were in order as follows: irrigation quota> nitrogen> phosphorus. There was a highly positive correlation between the estimating yields calculated by the model and harvest yields, of which predictive accuracy was up to 99%. Thus the irrigation quota and fertilizer application with maximum yield and their maximum yields were calculated by the regression model. On the basis of this, the optimum schemes of water and fertilizer to achieve target yields were proposed. If target yields were 9 300-9 600 kg/hm2, the irrigation quota, nitrogen and phosphorus application were from 9 730-10 500 m3/hm2, 272-363 kg/hm2 and 136-147 kg/hm2, respectively. If the economic benefits were considered, the optimum irrigation quota, nitrogen and phosphorus application were 8 500-9 015 m3/hm2, 225-240 kg/hm2 and 90-120 kg/hm2, respectively. The results from the different planting patterns showed that the yields of rice cultivated in aerobic soil by mulch drip irrigation were hardly different from those by the irrigation after direct seeding, which has roughly the same production costs as the rice seedlings transplanting cultivation, but, of which water use efficiency was much higher than that of the other three planting patterns(about 1.06 kg/m3 on average). Compared with the conventional transplanting seedlings cultivation, the planting way to rice cultivated in aerobic soil by mulch drip irrigation saves about 50% water and about 30% fertilizer.
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Received: 11 March 2015
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