| Effects of calcium and silicon on the root growth, NPK uptake, yield and water use efficiency of spring-grown tomatoes |
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| DOI：10.7606/j.issn.1000-7601.2021.01.19 |
| Key Words: tomato calcium potassium silicate water use efficiency NPK absorption |
| Author Name | Affiliation | | LI Yanmei | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China | | LIAO Shangqiang | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China | | ZHANG Lin | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China | | SUN Na | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China | | SUN Yanxin | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China | | YANG Jungang | Institute of Plant Nutrition and Resource, Beijing Academy of Agricultural and Forest Science, Beijing 100097, China |
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| Abstract: |
| In order to explore the improving effect of exogenous calcium (Ca) and silicon (Si) application on the growth and water utilization of spring\|grown tomatoes, five kinds of suspensions containing Ca(NO3)2, Ca(H2PO4)2, KSiO4, Ca(NO3)2+KSiO4, or Ca(H2PO4)2+KSiO4, were applied on the chosen tomato variety, Xinyu, at flowering and fruiting periods. The root growth, NPK uptake, yields, and water use efficiency were measured. The results showed that, spraying of above suspensions containing Ca or Si on tomato leaves significantly stimulated root growth, and greatly enhanced root and fruit PK uptake. Compared with Si and Ca-Si mixed suspension, single Ca\|containing suspension significantly increased root and fruit N uptake. Compared with control, Ca(NO3)2 and Ca(H2PO4)2 increased tomato yield by 9% and 7%, respectively, and increased water use efficiency by 7 kg·m-3 and 5.5 kg·m-3, respectively. Spraying of Ca(NO3)2+KSiO4 increased tomato yield by 4.7%, and increased water use efficiency by 3.8 kg·m-3. Spraying Ca(H2PO4)2+KSiO4 and KSiO4 did not achieve ideal yield\|increasing and water\|saving effects. Yield increase of tomato by Ca suspension alone was closely related to its role in stimulating root growth and increasing plant N uptake. Each kind of Ca suspension interacted significantly with KSiO4 when influencing tomato yield, their contribution to yield ranked as: calcium > calcium × KSiO4 > KSiO4. The leaf spraying technique with Ca suspension was simple and efficient, which helped facilitating the yield increase of tomato and the improvement of its biological water saving capacity. |
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