Data on soil texture, lime, gypsum, cation-exchange capacity, salinity, alkalinity, hydraulic conductivity and their interrelations and variations are discussed. An equation expresses the relationship between exchangeable Na and cations soluble in 1: 1 extracts. Special attention is paid to whether alkalization and structure deterioration will occur during reclamation. Gypsum contents seem to be adequate for replacement of Na by Ca during leaching but temporary decrease in permeability in early stages of leaching may occur due to retarded exchange reactions caused by the nature of the clay minerals. (Abstract retrieved from CAB Abstracts by CABI’s permission)

THE EXPERIMENTAL ORCHARDApple trees, Lombartscalville on r o o t s t o c k M I, were p l a n t e d in 1953 at a distance of 5 × 5 m on a shallow m a r i n e silty clay loam soil. After two years, trees of the s a m e v a r i e t y and r o o t s t o c k were i n t e r p l a n t e d so t h a t the distance * Former biologist at the Experiment Station for Fruit Growing, Wilhelminadorp (Z) ; at present Lady Principal of the Secondary Horticultural School for Girls, Rijswijk (Z.H.).

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