To study the effect of cultivation system （conventional and organic） on potato tuber components, 42 parameters （anti-nutritives, micro- and macro-elements and 23 metabolites） were studied in three multi-resistant ...To study the effect of cultivation system （conventional and organic） on potato tuber components, 42 parameters （anti-nutritives, micro- and macro-elements and 23 metabolites） were studied in three multi-resistant Hungarian potato varieties for three years in 2007-2009. Discriminant analysis of data proved that all investigated factors （farming technology, genotype and season/year） had significant effect on metabolites. Reversed phase high performance liquid chromatographic （HPLC-DAD, HPLC-MS） and elemental analysis methods have been adapted to quantify the major components, i.e., steroidal alkaloids, nitrite, nitrate, sugars, amino acids and micro-elements, in potato tubers. The absolute amount and changes of tuber components were influenced differentially by the technology, genotype and season in a complex manner. Any examined component, except nitrate content, was found to be significantly higher or lower consistently in relation to the production practice （organic or conventional） during the three years trials. Under the examined circumstances, no consequent positive effect of organic fanning on the total amount of anti-nutritive components, vitamins or micro- and macro-elements of potato tubers could be proven.展开更多
Two field experiments were carried out during growing seasons 2011 and 2012. It was executed in research farm of National Research Center in Nubaryia region, Egypt to study the effect of irrigation systems, fertigatio...Two field experiments were carried out during growing seasons 2011 and 2012. It was executed in research farm of National Research Center in Nubaryia region, Egypt to study the effect of irrigation systems, fertigation rates by using the wastewater of fish farms “WWFF” in irrigation of potato. Study factors were irrigation systems (sprinkler irrigation system “SIS” and trickle irrigation system “TIS”), water quality (traditional irrigation water “TIW” and WWFF) and fertigation rates “FR” (20%, 40%, 60%, 80% and 100% NPK). The following parameters were studied to evaluate the effect of study factors: 1) Calculating the total amount of WWFF per season;2) Chemical and biological description of WWFF;3) Clogging ratio of emitters;4) Yield of potato;5) Irrigation water use efficiency of potato “IWUEpotato”. Statistical analysis indicated that, maximum values were obtained of yield under SIS × FR100% NPK × WWFF, also, there were no significant differences for yield values under the following conditions: SIS × FR100% NPK × WWFF > SIS × FR80% NPK × WWFF > SIS × FR60% NPK × WWFF > TIS × FR100% NPK × TIW. This means that, using WWFF in the irrigation can save at least 40% from mineral fertilizers and 100% from irrigation water under sprinkler irrigation system.展开更多
Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditio...Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditionally used silver grass for mulch farming;furthermore,local farmers have learned from long-standing experience that Japanese knotweed(Fallopia japonica,Polygonaceae)is better for cultivation of solanaceous crops in this area.However,it is unclear why Japanese knotweed mulching is beneficial for cultivation of solanaceous crops.Thus,in this study,we hypothesized that Japanese knotweed mulching may be effective in avoiding hazards associated with continuous potato cropping,as native potato used to be cultivated twice a year in the past.Therefore,we investigated the effects of Japanese knotweed mulching on continuous potato cropping and after tomato cropping,which is another solanaceous crop species.Field experiments were conducted in 2018.First,we compared Japanese knotweed mulching,silver grass mulching and no grass mulching(control)in a soil under continuous potato cultivation and in an uncultivated soil.As a result,the extent of the potato yield decrease was reduced by Japanese knotweed mulching.Secondly,we compared Japanese knotweed-mulching and no grass mulching in a soil after a tomato crop and in an uncultivated soil.The extent of decrease in potato growth and yield was also reduced by Japanese knotweed mulching.These findings indicate that mulching with Japanese knotweed helped to avoid the risks associated with continuous potato cropping.展开更多
文摘To study the effect of cultivation system （conventional and organic） on potato tuber components, 42 parameters （anti-nutritives, micro- and macro-elements and 23 metabolites） were studied in three multi-resistant Hungarian potato varieties for three years in 2007-2009. Discriminant analysis of data proved that all investigated factors （farming technology, genotype and season/year） had significant effect on metabolites. Reversed phase high performance liquid chromatographic （HPLC-DAD, HPLC-MS） and elemental analysis methods have been adapted to quantify the major components, i.e., steroidal alkaloids, nitrite, nitrate, sugars, amino acids and micro-elements, in potato tubers. The absolute amount and changes of tuber components were influenced differentially by the technology, genotype and season in a complex manner. Any examined component, except nitrate content, was found to be significantly higher or lower consistently in relation to the production practice （organic or conventional） during the three years trials. Under the examined circumstances, no consequent positive effect of organic fanning on the total amount of anti-nutritive components, vitamins or micro- and macro-elements of potato tubers could be proven.
文摘Two field experiments were carried out during growing seasons 2011 and 2012. It was executed in research farm of National Research Center in Nubaryia region, Egypt to study the effect of irrigation systems, fertigation rates by using the wastewater of fish farms “WWFF” in irrigation of potato. Study factors were irrigation systems (sprinkler irrigation system “SIS” and trickle irrigation system “TIS”), water quality (traditional irrigation water “TIW” and WWFF) and fertigation rates “FR” (20%, 40%, 60%, 80% and 100% NPK). The following parameters were studied to evaluate the effect of study factors: 1) Calculating the total amount of WWFF per season;2) Chemical and biological description of WWFF;3) Clogging ratio of emitters;4) Yield of potato;5) Irrigation water use efficiency of potato “IWUEpotato”. Statistical analysis indicated that, maximum values were obtained of yield under SIS × FR100% NPK × WWFF, also, there were no significant differences for yield values under the following conditions: SIS × FR100% NPK × WWFF > SIS × FR80% NPK × WWFF > SIS × FR60% NPK × WWFF > TIS × FR100% NPK × TIW. This means that, using WWFF in the irrigation can save at least 40% from mineral fertilizers and 100% from irrigation water under sprinkler irrigation system.
文摘Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditionally used silver grass for mulch farming;furthermore,local farmers have learned from long-standing experience that Japanese knotweed(Fallopia japonica,Polygonaceae)is better for cultivation of solanaceous crops in this area.However,it is unclear why Japanese knotweed mulching is beneficial for cultivation of solanaceous crops.Thus,in this study,we hypothesized that Japanese knotweed mulching may be effective in avoiding hazards associated with continuous potato cropping,as native potato used to be cultivated twice a year in the past.Therefore,we investigated the effects of Japanese knotweed mulching on continuous potato cropping and after tomato cropping,which is another solanaceous crop species.Field experiments were conducted in 2018.First,we compared Japanese knotweed mulching,silver grass mulching and no grass mulching(control)in a soil under continuous potato cultivation and in an uncultivated soil.As a result,the extent of the potato yield decrease was reduced by Japanese knotweed mulching.Secondly,we compared Japanese knotweed-mulching and no grass mulching in a soil after a tomato crop and in an uncultivated soil.The extent of decrease in potato growth and yield was also reduced by Japanese knotweed mulching.These findings indicate that mulching with Japanese knotweed helped to avoid the risks associated with continuous potato cropping.
