Effects of Naphthenic and Paraffinic Petroleum Composition at a Comparable Molecular Weight or Viscosity on Photosynthesis of Eureka Lemon Leaves1

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Abstract
Experiments were conducted for the purpose of comparing the effects of naphthenic and paraffinic petroleum composition at comparable levels of molecular weight or viscosity on the apparent photosynthesis of Eureka lemon leaves. The procedures followell were the same as those described in a prior report. At a deposit level comparable to that of a practical field dosage, no effects on photosynthesis were evident for the difference in paraflinicity at a molecular weight of 306 to 308 or a viscosity of 70. In the high range of oil deposit, indicative or the situation in oil-soaked tissue, initial inhibition or photosynthesis was about the same, but recovery was faster for plants treated with the naphthenic oil than for those treated with the paratfinie oil of comparable molecular weight or viscosity. The difference in rate of recovery associated with the difference in paraffinicity is greater for oils of com parable viscosity than for those of com- parable molecular weight.