トマトの隔離床栽培における蒸気消毒後の硝酸化成菌の復活対策ならびに窒素施肥

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We studied the recovery of ammonium- and nitrite-oxidizing bacteria in isolated beds, and the change of inorganic nitrogen in the media in relation to the blossom end rot of tomatoes. 1) Three samples of bark compost obtained in the market were examined for nitrifying bacteria. Ammonium- and nitrite-oxidizing bacteria were 10^6-10^7 g^<-1> and 10^5-10^6 g^<-1>, respectively, in all samples. 2) The application of bark compost at a rate of 0.523 kg m^<-2> was effective in increasing the number of ammonium-oxidizing bacteria in the media. The population was 10^5 to 10^6 g^<-1> at a week after the application of unsteamed bark compost and was maintained thereafter. 3) Aeration by tillage did not promote the recovery of ammonium-oxidizing bacteria. 4) The recovery of nitrification was somewhat delayed as compared to that of the ammonium-oxidizing bacteria. The lower pH of the media enhanced the delay of nitrification. 5) Blossom end rot of tomatoes was often marked in isolated bed cultures. In the media Where nitrification had been delayed, remaining ammonium was likely to induce a Ca-related disorder. 6) Tomatoes were cultivated in the media supplemented with ammonium sulfate or rapeseed meal after media sterilization. The incidence of blossom end rot with rapeseed meal was lower than that with ammonium sulfate. 7) Since nitrification was often delayed in the media which were supplemented with ammo nium sulfate, the application of nitrate N was recommended together with bark compost.
社団法人日本土壌肥料学会の論文
1999-08-05

トマトの隔離床栽培における蒸気消毒後の硝酸化成菌の復活対策ならびに窒素施肥

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