Effect Of Facilities Vegetables For Calcium Absorption And Disease Resistance Of Tomato In Soil Of Phosphorus Accumulation

Protected cultivation has become the main high-quality and high-yield way for people to obtain fruit and vegetable, but in recent decades, people fertilize soil with excessive nitrogen fertilizer, especially in phosphate fertilizer, in order to pursue higher economic benefits, in order to pursue higher economic benefits, and facilities soil acidification and salinization and nutrient imbalance become more and more serious, phosphorus is accumulated gradually and calcium nutrition effectiveness reduces gradually, and nutrient absorption of crop becomes imbalanced. This paper studies different phosphorus content in soil of greenhouse by facility cultivation test and pot experiment on the pathogen of fusarium by using tomato as the tested materials, (available P content were 123.76,161.34,183.27,202.68,220.41,240.29,259.86, 282.38,304.56mgkg-1) the effects on tomato plant growth and development, calcium absorption and its resistance and soil calcium effectiveness. Test results are as follows:1. In the experiment of facility plot, the accumulation of phosphorus in soil has a significant effect on the growth and development of tomato and its physiological indexes. Soil available phosphorus can promote the growth and development of tomato seedlings, contribute to the synthesis of chlorophyll, improve the net photosynthetic rate, transpiration rate and stomata conductance of tomato leaves, increase the leaf water potential content, dry matter accumulation, with content of 220.41 and 240.29 mg-kg-1. It was also significantly higher than that of other treatments. After the accumulation of available phosphorus in the soil was more than 259.86 mg-kg-1, the growth and development of tomato was inhibited to a certain degree, and the yield was decreased. The yield of tomato showed a single peak trend with the increase of phosphorus content in the soil, and the peak value was reached under the condition of 240.29 mg·kg-1 in the soil available phosphorus content.2. The effect of soil phosphorus accumulation on the content of different forms of calcium is studied in the experiment of facility plot. During each period of tomato growth, with the gradual accumulation of phosphorus in soil, the water soluble calcium and exchangeable calcium in the soil of the facility were all showed the trend of first increasing and then decreasing, and the soil phosphorus content of 240.29mgkg-1 treatment was the highest, with phosphorus content of 220.41mgkg-1 is better. The acid soluble calcium in the facility soil showed a tendency to increase first and then decrease with the increase of phosphorus in the soil, and the phosphorus was more than 202.68mgkg"1, soil acid soluble calcium content is gradually decreased.3. In the facility plot test, the effect of phosphorus and calcium nutrition on the resistance of tomato plants was significant under the condition of soil phosphorus accumulation. In tomato growth of 4 determination period, the content of soil available phosphorus 220.41 and 240.29 mg-kg"1 processing tomato leaf cell membrane relative conductivity (REC) and the content of malondialdehyde (MDA) was the lowest, tomato disease resistance is the strongest; when leaf content of calcium and phosphorus ratio of greater than 1.42, tomato leaf REC and MDA content increased significantly, their resistance to disease relatively poor. Therefore, reasonable regulation of plant P nutrition absorption of calcium, phosphorus and calcium content in suitable proportion is conducive to enhancing its resistance to tomato.4. In the pot experiment, effects of soil phosphorus and calcium content of tomato wilt resistance on the results showed that the pathogen of Fusarium wilt after inoculation, the activities of protective enzymes in the leaf tissue were compared with before undergoing rapid and efficient improvement in soil available phosphorus was 240.29mg·kg-1 enzyme activity peak was higher and the content of available phosphorus was 220.41mg·kg+1 treatment; MDA and cell membrane of tomato leaves with different phosphorus content of soil permeability were significantly improved compared with before, the soil available phosphorus was 240.29mg·kg-1 MDA and cell membrane permeability is relatively low, available phosphorus content is 220.41mg-kg-1 is relatively low. It can be found that 240.29mg·kg-1 Processing Tomato wilt resistance had the strongest ability to soil available phosphorus, soil available phosphorus content is 220.41mg·kg-1 strong. And wilt before and after inoculation, the change trend of calcium content in leaves of tomato and defensive same indicators, and the correlation is better, increase the calcium content of tomato leaf can obviously improve the resistance to Fusarium Wilt of tomato.5.In the facility plot experiment, the effect of soil phosphorus accumulation and calcium content of tomato on the calcium content in soil was studied. The results show that in tomato growth and development in the process, the tomato roots, stems, calcium, fruit calcium content were with soil phosphorus element accumulated gradually showed the trend of first increased and then decreased, greenhouse soil of different forms of calcium content also with soil phosphorus element accumulated gradually showed the trend of first increased and then decreased and water soluble, exchange, Ca availability are based on the content of soil available phosphorus for 240.29mg·kg-1 optimal, as to the content of soil available phosphorus 220.41 mg·kg-1 better. Acid soluble calcium content in the soil available phosphorus content of 202.68mg·kg-1 treatment reached the maximum value.