| Application of mixture design to the test of combination of different types of nitrogen fertilizer on cucumber |
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| DOI：10.7606/j.issn.1000-7601.2008.01.11 |
| Key Words: cucumber coated release-controlled urea mixture design rate of nitrogen fertilizer combination economic benefit |
| Author Name | Affiliation | | LI Ke-fu | Agricultural Technical Extension Center of Huachi County?Huachi，Gansu 745600， China | | WANG Xin | Department of Life Sciences?Longdong University?Qingyang, Gansu 745000, China | | XU Qiu-ming | Institute of Plant Nutrition and Resources?Beijing Academy of Agriculture and Forestry, Beijing 100089, China | | CAO Bing | Institute of Plant Nutrition and Resources?Beijing Academy of Agriculture and Forestry, Beijing 100089, China | | XIAO Zhao-xia | Department of Life Sciences?Longdong University?Qingyang, Gansu 745000, China | | WANG Feng-qin | Department of Life Sciences?Longdong University?Qingyang, Gansu 745000, China |
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| Abstract: |
| Field tests were carried out to study the simplex centroid design combination of coated urea and urea on cucumber,and the yield and its composition of cucumber were determined.By establishing yield regression equation of all factors,analysis of fertilizer efficacy and its economic benefits was made.The results show that in the rate of x1(urea U)=0.20,x2(release-controlled urea D60)=0.50 and x3(release-controlled urea D30)=0.30,which can be converted into the actual combination of nitrogen fertilization as x1=7.0 kg,x2=17.5 kg and x3=10.5 kg per 667 m2,the expected highest yield can reach 8 173 kg/667m2.The combination of D30 and D60 can increase the cucumber yield by 1 766 kg/667m2 compared with only urea fertilization,with an increase rate of 29.3%.While the results of the economic benefit analysis indicate that the treatment of UD60D30 can gain a profit of 3 753.51 yuan/667m2,with an output-input ratio of 15.46∶1.Therefore,the mixture of urea and two kinds of release-controlled urea in certain rate is favorable to increasing cucumber yield and farmers' income. |
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