| Effects of drip fertigation levels on potato growth and the water and fertilizer efficiency on sandy soil in Inner Mongolia |
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| DOI：10.7606/j.issn.1000-7601.2017.05.36 |
| Key Words: drip-fertigation soil matric potential fertilization amount proportion partial factor productivity from applied fertilizer irrigation water use efficiency |
| Author Name | Affiliation | | FENG Zhi-wen | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China
2.University of Chinese Academy of Sciences, Beijing 100049, China | | KANG Yao-hu | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China | | WAN Shu-qin | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China | | LIU Shi-ping | Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: |
| In view of the demand for water-fertilizer management of potato on sandy soil in Inner Mongolia, a 2-year field experiment comparing five fertigation levels on potato yield, irrigation water use efficiency and partial fertilizer productivity was carried out. The treatments included five fertigation levels, 10% (10%NPK), 30% (30%NPK), 50% (50%NPK), 70% (70%NPK) and 90% (90%NPK) of the recommended fertilizer dose (420∶105∶495 N∶P∶K kg·hm-2·year-1) in 2012 and 10% (10%NPK), 35% (35%NPK), 60% (60%NPK), 85% (85%NPK) and 110% (110%NPK) of the recommended fertilizer dose (390∶150∶465 N∶P∶K kg·hm-2·year-1) in 2013, respectively, and the recommended fertilizer dose was estimated based on the nutrient balance method. The soil matric potential at 20 cm depth under the emitters was controlled above -25 kPa for drip fertigation. The results showed that fertilization period with N and K was basically in line with principal periods with potato plants on absorption of N and K when tensiometer was applied to guide drip fertigation. Potato plant height, stem diameter, leaf area index, total biomass fresh weight and yield first increased and then decreased, and got the maximum under 70%～85% of fertilization in two years with the increase in the proportion of fertilization. The harvest index was relatively low, which can effectively extend the nutrient transfer period from aboveground to tuber, and accelerate to accumulate more nutrients in the tubers. The highest irrigation water use efficiency was gotten under 60%～70% of fertilization. The highest tuber yield in 2012 and 2013 were 32.2 and 32.4 t·hm-2 for 70%NPK and 85%NPK, respectively, which on par with the average yield of local enterprises using center-pivot irrigation system, while 157, 52 kg·hm-2 and 187 kg·hm-2 for N, P2O45 and K2O were saved, respectively. The potato yield, irrigation water and fertilizer use efficiency were high on sandy soil in Inner Mongolia when the amount of fertilization was about 85% of the recommended fertilizer dose and soil matric potential at 20 cm depth under the emitters was controlled above -25 kPa for drip fertigation. |
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