| The effect of coated urea on quality change tendency of soil nutrient and nutrient utilization of cucumber in greenhouse |
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| DOI：10.7606/j.issn.1000-7601.2008.06.24 |
| Key Words: greenhouse cucumber quality soil nutrient nitrogen utilization change tendency |
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| Abstract: |
| The method of the simplex centroid design of mixture experiment of greenhouse cucumber was used to establish the production model and carried out and the picture analysis was made of cucumber quality,the change tendency of soil nitrogen and the absorption regulation of stem and leaves in different time.A study study was also made on the nitrogen utilization of using both coated urea D30,D60 and normal urea.The results showed that: From analytic comparison of production,the best production was made by using D30 and D60 cooperatively,but there were no obvious difference in using D30D60 together;From the model of production analysis,if the amount of pure nitrogen was used per hm2 like: X1(U)=105.0 kg,X2(D60)=262.5 kg,X3(D30)=157.5 kg,it would take the top quality to up to 122.595 t/hm2.No matter single or complex fertilizing of coated urea,the tendency quality and nutrient of cucumber would be improved a lot with time passing.The coated urea would supply continually cucumber in the later time of growing with Alkal.N and Amm.N,which would show the evidence of using coated urea one time would meet the nutrient needs of the crop growth.The time of using D30D60 and D30D60 cooperatively is longer and the absorption of nitrogen in fruit is higher,but the absorption of nitrogen in stem and leaf are similar.The total nitrogen absorption of coated urea was higher than normal urea in greenhouse cucumber, especially the top was D30D60.The total nitrogen absorption of fruit,stem and leaf had the same regulation as fruit did.The top nitrogen utilization of D30D60 was 41.0%,about 130.32% more than normal urea,then the nitrogen utilization of D30D60 was 39.1%,about 119.73% more than normal one,so,two methods of using D30D60 and UD30D60 cooperatively could be choosen. |
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