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- Author or Editor: Winston W. Jones x
Abstract
The effects of plant nutrients on citrus fruit quality cannot be considered independently of their effects on yield. In some cases quality can be improved by sacrificing some yield;however, from the overall economic point of view, it is usually advantageous to sustain maximum fruit yield even though there may be some sacrifice in fruit quality. This report emphasizes the nutrient effects on quality in the ranges in which we expect maximum yield to be sustained. If the deficient ranges for yield are included, the degree of effects on quality is greater. The nutrient ranges and effects discussed are primarily those encountered by the authors under California conditions.
Abstract
‘Frost Valencia’ [Citrus sinensis (L.) Osbeck] budded to trifoliate orange rootstock [Poncirus trifoliata (L.) Raf. 1, with orange-colored fruit, were subjected to 4 temperature regimes consisting of 2 day-night shoot environments and 2 constant soil temperatures in 2 glasshouses. In the cool shoot environment (20×15°C, day×night air temperature), carotenoid content of fruit increased substantially, whereas, in the warm glasshouses (30×15°), carotenoid content either changed little (apical and equatorial regions) or decreased slightly (basal region). Chlorophyll content of fruit increased to detectable levels only in the warm glasshouse. Soil temperatures of 15 and 25° had little or no influence on carotenoid or chlorophyll content of fruit in either glasshouse. Thus, regreening occurred only in the warm shoot environment and at both root temperatures. These temperature effects did not appear to operate through a redistribution of nitrogen to the rind.