Studies on Summer Depression of Pasture Crops : 1. Influence of high temperature upon photosynthesis and respiration of some pasture crops

Abstract

Effects of temperature upon the photosynthesis and the respiration of five grasses and three legumes were studied. 1) Amounts of net photosynthesis of orchard grass and ladino clover were kept constant in the range from 20°C to 40°C, while respiratory consumption of their tops increased as temperature rose. 2) Even under high temperature condition root respiration of alfalfa and ladino clover was not so severely depressed as that of timothy and Kentucky blue grass.