研究了楝树籽不同方式的提取物 (NⅠ ,NⅡ )对普通铁质淋溶土壤、简育水耕人为土壤供N和N肥利用率的影响 .NⅠ可在一定程度上抑制这两种土壤产生NO3 N ,NⅡ在两种土壤上前期均能显著固定NH4+ N ,并在后期释放出NH4+ N .如果NⅠ和NⅡ ...研究了楝树籽不同方式的提取物 (NⅠ ,NⅡ )对普通铁质淋溶土壤、简育水耕人为土壤供N和N肥利用率的影响 .NⅠ可在一定程度上抑制这两种土壤产生NO3 N ,NⅡ在两种土壤上前期均能显著固定NH4+ N ,并在后期释放出NH4+ N .如果NⅠ和NⅡ 2种提取物同时与化肥N施入土壤 ,则可明显改善土壤的供N状况 ,使之与作物需N过程更吻合 .盆栽实验证明 ,NⅡ可显著提高肥熟旱耕人为土壤上作物对N肥的利用率 .展开更多
Root-Knot Nematodes （RKN） Meloidogyne spp. significantly affects glasshouse tomatoes in Central Greece. Elimination or halting J2s could be an efficient strategy to control RKN. Recently, it was reported that a comm...Root-Knot Nematodes （RKN） Meloidogyne spp. significantly affects glasshouse tomatoes in Central Greece. Elimination or halting J2s could be an efficient strategy to control RKN. Recently, it was reported that a commercial product of Neem （Azadirachta indica） seed extract （Azadirachtin 1% Emulsion Concentrate-EC） significantly reduced the number of galls on tomato roots and egg masses, compared to the untreated control. In the present study neem proved to have a direct immobilising effect on RKN J2s. Different concentrations （0, 0.05, 0,1, 0.25, 0.5, I, 5, 10, 25 and 50%） of the tested neem product were applied with water containing fresh J2s and in soil naturally infected with RKN. Records of immobilised J2s were taken after 10 min, 1 h, 6 h, 24 h and 72 h of Neem application in water and after six days of neem application into the soil. Neem solution concentrations 5% and 10%, resulted in 85% ± 3.2 and 100% of immobilised J2s. The same concentrations of neem when were added in the water for nematode extraction from the soil, resulted 14.25% ± 4.01 and 1.7%, of J2s extracted from the soil with a significant concentration effect （P = 0.008）, compared to the untreated control. However, the neem product at high application dose significant damage the tomato plants caused phytoxicity.展开更多
文摘Root-Knot Nematodes （RKN） Meloidogyne spp. significantly affects glasshouse tomatoes in Central Greece. Elimination or halting J2s could be an efficient strategy to control RKN. Recently, it was reported that a commercial product of Neem （Azadirachta indica） seed extract （Azadirachtin 1% Emulsion Concentrate-EC） significantly reduced the number of galls on tomato roots and egg masses, compared to the untreated control. In the present study neem proved to have a direct immobilising effect on RKN J2s. Different concentrations （0, 0.05, 0,1, 0.25, 0.5, I, 5, 10, 25 and 50%） of the tested neem product were applied with water containing fresh J2s and in soil naturally infected with RKN. Records of immobilised J2s were taken after 10 min, 1 h, 6 h, 24 h and 72 h of Neem application in water and after six days of neem application into the soil. Neem solution concentrations 5% and 10%, resulted in 85% ± 3.2 and 100% of immobilised J2s. The same concentrations of neem when were added in the water for nematode extraction from the soil, resulted 14.25% ± 4.01 and 1.7%, of J2s extracted from the soil with a significant concentration effect （P = 0.008）, compared to the untreated control. However, the neem product at high application dose significant damage the tomato plants caused phytoxicity.
