| Analysis of suitable meteorological condition for planting oil sunflower in agro-pastoral ecotone |
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| DOI：10.7606/j.issn.1000-7601.2013.03.39 |
| Key Words: sunflower sowing date phenology WUE yield formation |
| Author Name | Affiliation | | SHEN Jiaojiao | Shaanxi Meteorologieal Sertice Center, Xian, Shaanxi 710014, China | | WANG Jing | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | LI Jianke | Shaanxi Meteorologieal Sertice Center, Xian, Shaanxi 710014, China | | PAN Xuebiao | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | XU Hong | Shaanxi Meteorologieal Sertice Center, Xian, Shaanxi 710014, China | | GAO Hongyan | Shaanxi Meteorologieal Sertice Center, Xian, Shaanxi 710014, China |
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| Abstract: |
| In order to explore effects of different sowing dates on growth, development, yield formation and water use efficiency(WUE) of sunflower and provide a scientific basis for optimal sowing date and high yield of sunflower in A-gro-pastoral Ecotone, the phenology, morphologieal index, yield formation and WUE of sunflower under five sowing-date treatments, including SE(April28)、E(May8)、M(May18)、L(May28)and SL(June 8), were analyzed and 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 five sowing dates. Growing period of sunflower was shortened at a rate of 9 days on average with sowing date postponed by 10 days, length of reproductive stage in growing period was inereased, except SL in which sunflower was unable to mature due to deficient thermal time. LAI under L and SL was significantly higher than that of the rest of sowing date. SL had the maximum LAI. Dry matter of aboveground plant and dry weight of faceplate under M were
significantly higher than that under other sowing dates. Ratio of dry weight of faceplate to aboveground dry matter varied significantly among different sowing sates, the highest value(59%) and the lowest value(7%)appeared under M and SL respectively. As for as yield and 1000-grain weight is concered,
there was no significant difference between SE、E and M, reached 2 583 kg·hm-2 and 29.66 g averagely, but they were obviously higher than that under SL.WUE decreased when sowing date was delayed, the highest value(11.9 kg·hm-2·mm-1) and the lowest value(5.5kg·hm-2mm-1)occurred under E and SL.The suitable drought during emergencing period was advanlageous to improve the WUE. Middle May was recommended as appropriate sowing date of sunflower in Agro-pastoral Ecotone. |
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