Influence of Pesticides

Rhizobium and Legume Root Nodulation
Leguminous Plants
The Discovery of Symbiotic Nitrogen Fixation
Rhizobium Classification
Cultural Characteristics
Genetics
Flavonoids Induce Nodualation
Novel Approaches to Extend Root Nodulation
Ecology
Infection
Lectins
Structure of the Nodule
Function of the Nodule
Nitrogenase Hydrogenase Interrelationship
Stem Nodulating Legumes
Factors Affecting Nodulation
Temperature and Light
Hydrogen Ion Concentration
Mineral Nutrition

Influence of Pesticides

Influence of Pesticides
In modern agriculture, application of pesticides is an accepted practice towards controlling pests and diseases of plants and some of these chemicals may influence the microbiological processes in soil. Pot trials conducted at the Indian Agricultural Research Institute, New Delhi, reveal that the recommended doses of thiram, captan, PCNB, disyston, thimet and cerasan do not interfere with nodulation or grain yields of pulse crops.

On the other hand, herbicides influence nodulation and nitrogen fixation in legumes. Field trials with birdsfoot trefoil (Lotus comiculatus) using 2,4-DB and dalapon show that 2,4-DB, alone or in combination with dalapon reduces nodulation and tends to decrease the efficiency of nitrogen fixation. Dalapon appears to enhance the inhibitory action of 2,4DB on nodulation. Autoradiographs indicate that the herbicide is translocated rapidly and could be detected in leaves and nodules in 12 hours after feeding with 2,4-DB-I-C¹⁴. Fractionation of excised nodules reveal the presence of radioactivity in bacteroids, the highest being in the soluble portion. Dichlorodiphenyl trichloro-ethane (DDT) when applied to soil does not affect the leghaemoglobin content of green gram (Phaseolus aureus) up to 40 ppm. On the other hand, at 1-10 ppm levels, the insecticide appears to stimulate the pigment content.

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