| Study of soil moisture lower limits and irrigation index at seedling stage of capsicum |
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| DOI：10.7606/j.issn.1000-7601.2013.03.11 |
| Key Words: capsicum seedling stage irrigation index soil moisture quadratie rotation-orthogonal regressive combination design |
| Author Name | Affiliation | | MA Tian | Shenzhen Water Planning and Design Institute, Shenzhen, Guangdong 518036, China | | FAN Xingke | lnstitute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling, Shaanxi 712100, China | | WU Pute | lnstitute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resources, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Based on pot experiment, this paper studied coordinative effects of soil moisture lower limits and irriga-tion upper limit at seedling stage on the late stage yield of capsicum. The results showed that irrigation upper limit and soil moisture lower limits had obvious positive and interactive effects to capsicum yield. Main effect of upper irrigation limit was 1.65 times higher than that of lower moisture limit. Upper irrigation limit and soil moisture lower limit satisfied Diminishing Returns function. There was a reasonable coordinative zone between irrigation upper limit and soil moisture lower limit. For irrigation upper limit, rational range was from 62% to 84.1%; For the soil moisture lower limit, it was from 40% to 49%. In these rational ranges, increasing either irrigation upper limit or soil moisture lower limit could increase capsicum yield, and effect of upper irrigation limit and lower moisture limit were compensated each other in those ranges. In other words, decreasing irrigation upper limit (or moisture lower limit) could be compensated by increasing moisture lower limit(or irrigation upper limit) to maintain a stable and no-decreasing yield. The appropriate irrigation upper limit and soil moisture lower limit for potted eapsicum of maximum yield were 84.1% and 49% of field eapacity, respectively. |
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