Chopped straws can help replenish soil nutrients,improve soil structure,and increase the amount of organic matter contained in soil.The grinding ability of crop straws is influenced by the frictional characteristics o...Chopped straws can help replenish soil nutrients,improve soil structure,and increase the amount of organic matter contained in soil.The grinding ability of crop straws is influenced by the frictional characteristics of the materials involved in the grinding process.Studying the frictional properties of peanut stem,residual film,and external contact material is essential to understanding the grinding action of peanuts.This study discussed the frictional properties between films and between residual film and external contact materials.A physical test was conducted using a friction coefficient detector.The results showed that the average value of the dynamic sliding friction coefficient(f_(k))was 0.34,the average value of the static sliding friction coefficient(f_(s))between the film and the 40Cr steel plate(as the external contact material)was 0.38,and the average f_(s) value between the films and between the residual film and the external contact material was 0.36.Based on the Box-Behnken test,second-order response models were established for the static rolling stability angle(μ_(e))and the static sliding friction coefficient(f_(s)).On the basis of establishing the static rolling stability angle(μ_(e))and static sliding friction coefficient(f_(s))of the evaluation index,the different friction characteristics between straw and external contact materials were investigated under varying moisture content,external contact materials and particle sizes.The study results can provide a basis for the development of equipment that can be used for peanut straw crushing and membrane separation.展开更多
To find an effective method for ensiling peanut vine （PV）, fermentation characteristics and nutritional values of PV silage and the mixture of PV with corn stover （CS） silage in a ratio of 1 ： 1 fresh weight, pre...To find an effective method for ensiling peanut vine （PV）, fermentation characteristics and nutritional values of PV silage and the mixture of PV with corn stover （CS） silage in a ratio of 1 ： 1 fresh weight, prepared by adding lactic acid bacteria （LAB）, 10% wheat bran （WB） and LAB＋WB at ensiling were evaluated in 2009 and 2010. The fermentation qualities of PV silage ensiled with the LAB and WB additives were improved compared with those of the control （PV ensiled alone）. However, the pH did not decline to the critical level of 4.2, and the nutritional values of the silage were not protected against losses in the LAB and WB addition silages. Ensiling PV in mixture with CS generated optimal moisture content and buffering capacity （BC） of ensiled materials. After adding the LAB and WB additives to mixture silage, especially adding LAB＋WB, the fermentation qualities and nutritional values of the mixture silage were improved significantly （P〈0.05）, and the Flieg＇s score reached to 99. The result suggested that it is a feasible method to ensile the mixed materials of PV with CS by adding LAB and high concentration of water soluble-carbohydrate materials for providing a good fermentation quality of PV silage.展开更多
基金supported by the National Nature Foundation Project(Grant No.52175238)the Key Research and Development Plan Project of Xinjiang Autonomous Region(Grant No.2022B02022-1)+1 种基金the integrated pilot project of agricultural machinery Research and Development,Manufacturing and Application in Shandong Province(Grant No.NJYTHSD-202321)the Ministry of Industry and Information Technology residual film recycling machine project(23128).
文摘Chopped straws can help replenish soil nutrients,improve soil structure,and increase the amount of organic matter contained in soil.The grinding ability of crop straws is influenced by the frictional characteristics of the materials involved in the grinding process.Studying the frictional properties of peanut stem,residual film,and external contact material is essential to understanding the grinding action of peanuts.This study discussed the frictional properties between films and between residual film and external contact materials.A physical test was conducted using a friction coefficient detector.The results showed that the average value of the dynamic sliding friction coefficient(f_(k))was 0.34,the average value of the static sliding friction coefficient(f_(s))between the film and the 40Cr steel plate(as the external contact material)was 0.38,and the average f_(s) value between the films and between the residual film and the external contact material was 0.36.Based on the Box-Behnken test,second-order response models were established for the static rolling stability angle(μ_(e))and the static sliding friction coefficient(f_(s)).On the basis of establishing the static rolling stability angle(μ_(e))and static sliding friction coefficient(f_(s))of the evaluation index,the different friction characteristics between straw and external contact materials were investigated under varying moisture content,external contact materials and particle sizes.The study results can provide a basis for the development of equipment that can be used for peanut straw crushing and membrane separation.
基金funded by the National Key Technology Research and Development Program of China(2009BADA6B06)
文摘To find an effective method for ensiling peanut vine （PV）, fermentation characteristics and nutritional values of PV silage and the mixture of PV with corn stover （CS） silage in a ratio of 1 ： 1 fresh weight, prepared by adding lactic acid bacteria （LAB）, 10% wheat bran （WB） and LAB＋WB at ensiling were evaluated in 2009 and 2010. The fermentation qualities of PV silage ensiled with the LAB and WB additives were improved compared with those of the control （PV ensiled alone）. However, the pH did not decline to the critical level of 4.2, and the nutritional values of the silage were not protected against losses in the LAB and WB addition silages. Ensiling PV in mixture with CS generated optimal moisture content and buffering capacity （BC） of ensiled materials. After adding the LAB and WB additives to mixture silage, especially adding LAB＋WB, the fermentation qualities and nutritional values of the mixture silage were improved significantly （P〈0.05）, and the Flieg＇s score reached to 99. The result suggested that it is a feasible method to ensile the mixed materials of PV with CS by adding LAB and high concentration of water soluble-carbohydrate materials for providing a good fermentation quality of PV silage.
