| The effects of shading in seedling stage on growth and yield of spring potato in Yunnan Province |
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| DOI：10.7606/j.issn.1000-7601.2018.03.16 |
| Key Words: spring potato seedling stage shading growth index yield Yunnan Province |
| Author Name | Affiliation | | LI Cai-bin | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | ZHOU Jin-hua | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | TANG Wen-jun | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | GUO Hua-chun | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | WANG Ting-ting | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | YANG Hui-ju | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | ZHANG Guang-hai | Root &Tuber Crops Research Institute, Yunnan Agricultural University, Kunming, Yunnan 650201, China |
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| Abstract: |
| To study the effects of shading in seedling stage on growth and yield of spring potato in Yunnan, we set up different shading treatments with black shading net of 70% shading rate in 2015~2016’s field trial. In 2015, we set up shading treatment for potato seedlings (15 d shading in early growth stage). In 2016, we set up seven shading treatments as following: 90 d shading treatment (the whole growth period), 15 d shading in early growth stage, 30 d shading in early growth stage, 60 d shading in early growth stage, 60 d shading from 30 days after germination, 30 d shading from 30 days after germination and 30 d shading from 60 days after germination. No shading treatment was used as control. The experimental results indicated that shading in seedling stage can promote stem and leaf development of potato. Compared with the control group, plant height, node length and leaf area of potato increased by 179.03%, 163.41% and 61.68% respectively, after treatment, and the differences were extremely significant. Shading, was most favorable to potato stem growth, and the stem fresh weight, stem and leaf fresh weight and total biomass increased by 286.23%, 151.55% and 136.66%, respectively, compared with CK, and the differences were significant. Two years data showed that shading treatment to potato seedling increased tuber number per plant from 11.67% to 58.06% compared with CK. The tuber yield per plant was increased from 17.78% to 41.05%. And it could maintain a comparatively higher commodity-potato-weight ratio. It was slightly lower than CK in 2015, and 4.34% higher than CK in 2016, due to the weather condition in 2015 and 2016, there were di-fferent effects on the tuber number and yield in two years. However, other shading treatments led to the declined tuber numbers and yield. |
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