Effects of amino acid fertilizer and rhamnolipid on salt tolerance and yield of tomato
Moderately saline soil was used as the test soil and Provence tomato varieties were used as the test materials to explore the effects of different ratios of amino acid fertilizer and rhamnolipid on the growth and develop-ment,salt tolerance and yield of tomato.The results showed that under the condition of conventional fertilization in moderately saline soil(nitrogen phosphorus potassium compound fertilizer N:P2O5:K2O=20:10:15 basal ap-plication,high potassium compound fertilizer N:P2O5:K2O=10:5:25 follow-up application),the application of amino acid fertilizer alone(irrigation of 300 L·hm-2 amino acid fertilizer)significantly increased tomato proline content,with a 13.9％increase compared to CF.The combination of amino acid fertilizer and 24 L·hm-2 rhamnol-ipid treatment could further improve tomato salt tolerance and reduce cell oxidative damage,compared with the ap-plication of amino acid fertilizer alone,this treatment significantly increased peroxidase activity and proline content by 31.4％and 20.6％,respectively,and the rate of superoxide anion(O—·2)production,malondialdehyde content,and Na+/K+in leaves were significantly reduced by 23.8％,26.6％,and 43.0％,respectively.Meanwhile,amino acid fertilizer applied with 24 L·hm-2 rhamnolipid treatment had the highest tomato yield,soluble sugar and Vc content,which increased by 38.5％,14.2％,and 18.2％,respectively,compared with amino acid fertilizer applied alone treatment.Overall,300 L·hm-2 amino acid fertilizer with 24 L·hm-2 rhamnolipid has the best effect,which can effectively alleviate the damage of salt stress on the cell membrane,improve the osmotic regulating ability and leaf photosynthesis,and then enhance the salt tolerance of tomato to achieve a synergistic enhancement of yield and quality.
万方数据
维普
