| Effect of reduced K amount and split application on yield and nutrient utilization of potato on upland |
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| DOI：10.7606/j.issn.1000-7601.2018.02.01 |
| Key Words: potato potassium fertilizer reduced K application in different proportion by states yield potassium use efficiency |
| Author Name | Affiliation | | YIN Mei | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China | | ZENG Qing-feng | Fertility Station of Huize in Yunnan Province, Huize,Yunnan 654299, China | | ZHANG Qiong | Fertility Station of Huize in Yunnan Province, Huize,Yunnan 654300, China | | HOU Jun | Fertility Station of Huize in Yunnan Province, Huize,Yunnan 654301, China | | ZHANG Fa-kui | Fertility Station of Huize in Yunnan Province, Huize,Yunnan 654302, China | | CHEN Hua | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China | | CHEN Jian-feng | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China | | WANG Zhi-yuan | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China | | FU Li-bo | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China | | SU Fan | Agricultural Environment and Resources Institute, Yunnan Academy of Agricultural Sciences, Kunming,Yunnan 650205, China |
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| Abstract: |
| The field experiments were conducted on low and high fertility farm land in Yunnan Huize, in order to investigate the effects of reduced K amount and split application on yield, net earning, KUE, KAUE and KPEP of upland potato. The results indicated that K application had significant effect on growth of potato. Yield of potato with K application treatment was higher than yield of potato without K application treatment by 17.39%～42.88%. Net earning with K application treatment was higher than that without K application treatment by 15.40%～40.92%. With the same treatment, the yield, net earning, KUE, KAUE and KPEP of potato in high fertility farm land were higher than those in low fertility farm land. Both in high fertility farm land and in low fertility farm land, when the same amount of K fertilizer was used, yield and net earning with 90% K（30%+60%）treatment or 70% K（20%+50%）treatment are higher than those with 90% K（40%+50%）treatment or 70% K（30%+40%）treatment, yield and net earning with 90% K（40%+50%）treatment or 70% K（30%+40%）treatment are higher than those with 90% K treatment or 70% K treatment. In high fertility farm land, yield of potato with 100%K treatment was 29 544.44 kg·hm-2 and it was the highest in all treatments. Yield of potato with 90% K（30%+60%）treatment was 28 770.83 kg·hm-2 and it was not significant difference with that with 100%K treatment. KUE, KAUE and KPEP of potato with 70% K（20%+50%）treatment were higher than those with other treatments and they respectively were 36.84%, 58.11 kg·kg-1 and 222.22 kg·kg-1. In low fertility farm land, yield, KUE, KAUE and KPEP of potato with 90% K（30%+60%） treatment or 70% K（20%+50%）treatment were higher than those with 100%K treatment. Yield, KUE, KAUE and KPEP of potato with 90% K（30%+60%）treatment respectively were 17 640.28 kg·hm-2, 20.24%, 31.13 kg·kg-1 and 108.89 kg·kg-1, those with 70% K（20%+50%）treatment respectively were 17 404.17 kg·hm-2, 26.57%, 38.15 kg·kg-1 and 138.13 kg·kg-1, and those with 100%K treatment respectively were 17 091.67 kg·hm-2, 17.49%, 24.97 kg·kg-1 and 94.95 kg·kg-1. Effects of reduced K amount and split application on yield, net earning, KUE, KAUE and KPEP of upland potato were better than effect of K application for single base fertilizer. Effect of reduced K amount and split application in low fertility farm land was more significant than that in high fertility farm land. Thus we commended that 162 kg·hm-2 K2O in high fertility farm, 126～162 kg·hm-2 K2O in low fertility farm, and K application by 30% in seedling and 70% in squaring stage be adopted for potato production in Yunnan upland. |
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