| Effect of sowing date on the growth and yield formation and water use efficiency of potato in Agro-pastoral Ecotone |
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| DOI：10.7606/j.issn.1000-7601.2012.02.24 |
| Key Words: sowing date phenology yield formation WUE potato |
| Author Name | Affiliation | | SHEN Jiaojiao | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Shaanxi Meteorological Service Center, Xi'an, Shaanxi 710014, China | | WANG Jing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Ecology and Environment Experimental Station for Field Scientific Observation in Huhhot, Ministry of Agriculture, Huhhot, Inner Mongolia 011705, China | | PAN Xuebiao | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Ecology and Environment Experimental Station for Field Scientific Observation in Huhhot, Ministry of Agriculture, Huhhot, Inner Mongolia 011705, China | | FENG Liping | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | ZHAO Peiyi | Key Ecology and Environment Experimental Station for Field Scientific Observation in Huhhot, Ministry of Agriculture, Huhhot, Inner Mongolia 011705, China | | CHEN Chen | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Key Ecology and Environment Experimental Station for Field Scientific Observation in Huhhot, Ministry of Agriculture, Huhhot, Inner Mongolia 011705, China |
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| Abstract: |
| In order to study the effects of different sowing dates on the growth, development, yield formation and water use efficiency (WUE) of potato and provide a scientific basis for optimal sowing date and high yield of potato in Agro-pastoral Ecotone, phenology, morphological index, yield formation and WUE of potato under five sowing-date treatments of SE(April 28), E(May 8), M(May 18), L(May 28) and SL(June 8) were compared using randomized block design based on a field experiment in WuChuan county. The results showed that phenology, plant height and leaf area index (LAI) were significantly different under different sowing dates. The growing period of potato was shortened at a rate of 6 days averagely with the sowing date postponed by 10 days, whilst the ratio of the reproductive stage in gr
owing period was increased, which reached 45% and 59% respectively under SE and SL treatments. Aboveground dry matter accumulation under SE and E treatments were significantly lower than that of other sowing dates. In the whole period, the
fresh tuber weight increased as the Logistic growth curve. Total yield and yield of big potato as well as the number of big potatoes in all were significantly different. The difference of yield between M, L and SL treatments was not significant and their averaged yield reached 21 593 kg/hm2, while there were also no significant difference in yield between SE and E treatments, reached 15 181 kg/hm2 averagely. WUE increased as the sowing date delayed. The highest value and the lowest value of WUE occurred under SE and SL treatments, which were 45.2 kg/(hm2·mm) and 86.3 kg/(hm2·mm) respectively. The appropriate sowing date of potato in Agro-pastoral Ecotone was recommended to be arranged in middle-late May. |
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