| Influence of foliar spraying magnesium on uptake and distribution of nutrients in magnesium deficient tomatoe grown under greenhouse |
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| DOI：10.7606/j.issn.1000-7601.2017.03.35 |
| Key Words: tomato magnesium fertilizer foliar fertilization nutrient distribution greenhouse |
| Author Name | Affiliation | | WANG Hui-min | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | JIN Xiao-yong | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | LIU Ying-chao | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China | | CHEN Zhu-jun | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China | | CAO Jing-yang | Yangling Agricultural Technology Extension Station, Yangling, Shaanxi 712100, China | | ZHOU Jian-bin | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Magnesium is an essential nutrient and a constituent of chlorophyll. The deficiency of Mg is common in tomato grown in calcareous soil under solar greenhouse in North China in recent years. It largely affects the fruit yield and quality. Five treatments comprising of different concentration and magnesium fertilizer sources were applied to autumn-winter season tomato by foliage spray. The results showed that: (1) the contents of magnesium and potassium in tomato leaves decreased with time while the calcium content decreased in first and then became stable. The decreasing trend of magnesium and calcium were highest during the period from the first cluster fruit expanding stage to the second cluster fruit expanding stage, the decrease was 17.8% and 39.1%, respectively. (2) Spraying magnesium fertilizer increased the magnesium concentration and nutrient uptake in tomato leaves, but there was no significant difference among the treatments in magnesium concentration and nutrient uptake in roots, stem and fruits (P>0.05). Mg applied at 0.4% (MgSO4·7H2O) improved magnesium concentration (1.55 times) and nutrient uptake (1.78 times) in tomato leaves compared with the CK. The improvement in tomato yield at both Mg concentrations (0.2 and 0.4%) of MgSO4·7H2O and 0.2% of Mg(NO3)2·6H2O was 8.0, 8.9 and 5.3% respectively compared with that of CK. However, the difference was not significant among treatments (P>0.05). (3) The soil exchangeable K/Mg ratio exceeded 0.5, which indicated a serious nutrient imbalance in soil. Even under magnesium spray, the transportation of magnesium from leaves to other organs of tomato was limited. Therefore, some measures should be taken to reduce potassium fertilizer rate and maintain the nutrients balanced in soil. |
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