This study was conducted to study the optimum dosage of potassium ful- vate （PF） on greenhouse tomato, the effects of different amounts of PF on yield and quality of greenhouse tomato and soil physical and chemical ...This study was conducted to study the optimum dosage of potassium ful- vate （PF） on greenhouse tomato, the effects of different amounts of PF on yield and quality of greenhouse tomato and soil physical and chemical properties were investigated by a field plot experiment. The results showed that the bottom applica- tion of PF increased tomato yield, plant dry matter weight and root dry matter weight by 14.0%, 14.4 and 50.6%, respectively; Vc and soluble sugar content of tomato increased by 1＆5% and 10.0%, respectively; and soil bulk density de- creased by 3.6%, and CEC increased by 5.0%. All the indexes increased with the increase of PF application amount, and reached the maximum value when the PF application rate was 4 500 kg/hm2. In consideration of the cost of fertilizer and all indexes, the optimum dosaqe of PF fertilizer was 4 500 kg/hm2.展开更多
Here is a study on the physical and mechanical properties of the naturally conserved regenerated fly-ash concrete.The result from the study indicates that fixing the amount of the regenerated raw materials and admixin...Here is a study on the physical and mechanical properties of the naturally conserved regenerated fly-ash concrete.The result from the study indicates that fixing the amount of the regenerated raw materials and admixing proper amount of fly-ash can improve the compression strength of the regenerated concrete and the improved effects vary according to the ingredients and their different amounts of the regenerated raw materials.With the increase of the added amount of the fly-ash,the maximum values of the bone-dryness density and compression strength of the regenerated concrete appear.But when the maximum values appear,the admixture of the fly-ash is different.The water absorption of the regenerated concrete and the water consumption of the mixtures keep rising with the increase of the admixture of the fly-ash.When the regenerated concrete and the products made of it are prepared and produced,the mixture of the fly-ash should be determined reasonably.展开更多
文摘This study was conducted to study the optimum dosage of potassium ful- vate （PF） on greenhouse tomato, the effects of different amounts of PF on yield and quality of greenhouse tomato and soil physical and chemical properties were investigated by a field plot experiment. The results showed that the bottom applica- tion of PF increased tomato yield, plant dry matter weight and root dry matter weight by 14.0%, 14.4 and 50.6%, respectively; Vc and soluble sugar content of tomato increased by 1＆5% and 10.0%, respectively; and soil bulk density de- creased by 3.6%, and CEC increased by 5.0%. All the indexes increased with the increase of PF application amount, and reached the maximum value when the PF application rate was 4 500 kg/hm2. In consideration of the cost of fertilizer and all indexes, the optimum dosaqe of PF fertilizer was 4 500 kg/hm2.
文摘Here is a study on the physical and mechanical properties of the naturally conserved regenerated fly-ash concrete.The result from the study indicates that fixing the amount of the regenerated raw materials and admixing proper amount of fly-ash can improve the compression strength of the regenerated concrete and the improved effects vary according to the ingredients and their different amounts of the regenerated raw materials.With the increase of the added amount of the fly-ash,the maximum values of the bone-dryness density and compression strength of the regenerated concrete appear.But when the maximum values appear,the admixture of the fly-ash is different.The water absorption of the regenerated concrete and the water consumption of the mixtures keep rising with the increase of the admixture of the fly-ash.When the regenerated concrete and the products made of it are prepared and produced,the mixture of the fly-ash should be determined reasonably.
