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population density ofplanthoppers in tlie latter. The nitrogen contcnt of rice plants was found to be the lowest in the organically farrned field. The content of arnino acids in the phloem sap of potted rice plants wus comparcd between thc chemically ancl thc organically fertilized cultivations. Thc amount of total arnino acids tcnded to bc smaller in the plants from the organic cultivation. The contcnt of thc asparagine was significantly lowcr in the orgaiiically cultivated plants, In pot experimcnts, the survival rate of the n>Tnphs ofArilc4]avaata gugeny and Sbgatedo.liercitim was lower in the organic plant than in thc chemically cultivated ones. Kig), uJords: .Miaparoala tagens} Sugatella.litrcgthra, o ganic farming, arrrino acid, phloein sap

Effect of Organic Rice Farming on Leafhoppers and Planthoppers : 2. Amino Acid Content in the Rice Phloem Sap and Survival Rate of Planthoppers