Kiwifruit (Actinidia spp.) are known to be sensisoils with low organic matter. Symptoms most com-sis in spring and sometimes fruit chlorosis at harvest. A. chinensis var. chinensis which appears to be especially sensiduring summer and autumn, in addition to the curduring spring and early summer. Both spring and fruit chlorosis was observed, especially in fruit har-late applied in late summer and autumn increased the chlorophyll concentration of leaves in the following spring but not in summer and increased the concentrations of carotenoid and chlorophyll pigments to promote earlier de-greening compared with that of control fruit. Average fruit size, dry matter, solusimilar in fruit on control and treated vines, but these results were confounded by treatment-induced difcold storage, or the incidence of fruit chlorosis. While -tainable. The development of kiwifruit rootstocks tolerant of high pH soils remains the best and most sustainable solution for growers. Keywords yield, Italy What is already known on this subject? • Several fruit crops, including kiwifruit, develop leaf alkaline and/or calcareous soils is limited. Severe leaf • chlorosis on reduced vine productivity, fruit quality A. chinensis var. chinensis.What is the expected impact on horticulture? • Since most of the global production of kiwifruit is now in regions with alkaline and/or calcareous soils, it is important that growers are aware of the real cost of chilling damage during cold storage.
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