Effects of chemical fertilizer reduction combined with organic fertilizer and microbial fertilizer on photosynthetic characteristics and fertilizer utilization rate of tomato
In order to reduce chemical fertilizers and speed up the replacement of chemical fertilizers with organic fertilizers and promote the application of microbial fertilizers,tomato Duojiruixing was used as the test material,and six fertilization treatments were set up in the experiment to study the effects of chemical fertilizer reduction on the growth characteristics and fertilizer utilization rate of facility tomato.The effects of chemical fertilizer reduction on the growth characteristics and fertilizer utilization rate of facility tomato were studied in order to find the appropriate reduction ratio from the response mechanism of photosynthetic characteristics and fertilizer utilization rate to chemical fertilizer reduction.The results showed that the plant height decreased with the increase of chemical fertilizer reduction,and the growth of plant height,root system and ear number of tomato could be promoted by applying organic fertilizer and biological bacterial fertilizer.RFM1 treatment increased SPAD,nitrogen value,stomatal conductance and net photosynthetic rate.The available phosphorus and available potassium increased with the increase of organic fertilizer,and decreased with the increase of organic fertilizer after the application of microbial fertilizer.The utilization rate of nitrogen fertilizer,phosphorus fertilizer and potassium fertilizer was higher in RFM2 treatment,but not significantly different from RFM1.RFM1 treated tomato had the highest content of soluble solids,vitamin C and lycopene,which effectively reduced the content of organic acids.The yields of tomatos treated by RF1,RF2,RFM1 and RFM2 were 4.41%,-6.54%,8.14%and 0.82%higher than that of CF,and RFM1 was highest.Collectively,in facility tomato cultivation,20%of chemical fertilizer can be replaced by organic fertilizer and microbial fertilizer to achieve the effect of chemical fertilizer reduction.
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