Mevinphos and Phosphamidon: Influence of Plant Nutrition on Uptake and Effectiveness12

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Abstract
The uptake of mevinphos and phosphamidon by bean plants was altered when the supply levels of phosphorus, potassium, magnesium, nitrogen, sulphur, and calcium were varied. The influence of the uptake on the acaricidal effectiveness and the phytotoxic action were studied. Increased effectiveness of mevinphos and phosphamidon were associated with increased supply levels of phosphorus, potassium, and magnesium. Decreased effectiveness of mevinphos was associated with increased supply levels of nitrogen and sulphur, but effectiveness of phosphamidon was increased at increased supply levels of these 2 minerals. Greater effectiveness of mevinphos was associated with increased supply levels of calcium. In general as the acaricide-absorbing capacity of the plants increased, the acaricidal effectiveness of plants also increased. The phytotoxicity of mevinphos and phosphamidon was accentuated in the plants receiving low-nitrogen, high-phosphorus, potassium-deficient, low-calcium, high-magnesium, or sulphur-deficient treatments. The low concentration of mevinphos and phosphamidon increased the fresh and dry weights of the plants under conditions of low-phosphorus supply.

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