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CACTI THE ILLUSTRATED DICTIONARU by Rod Preston-Mafham

By Rod Preston-Mafham

This dictionary concentrates at the globular cacti, relatively Mammillaria, yet contains a few well known columnar cactus kinds comparable to Echinocereus.

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Development of salt affected soils. In, Natural Systems for Development, What Planners Need to know. P. W. Jordan and R. Jensen, editors. MacMillan, New York p. 162-228. 10. FAO - UNESCO (1994). Soil map of the world. Revised legend with corrections. Technical paper No. 20, ISRIC, Wageningen, 139 pp. 11. R. (1978). Interacciones hombre-clima en la desertificacion del Norte Chico chileno. Ciencia e investigacion agraria 5: 137-142. 12. B. and Strossnijder, L. (1984). Crustformation on sandy soils in the Sahel.

Dwivedi, R. S. (1994). Study of salinity and waterlogging in Uttar Pradesh (India) using remote sensing data. Land Degradation and rehabilitation 5: 191-199. 9. , and Abrol, I. (1983). Development of salt affected soils. In, Natural Systems for Development, What Planners Need to know. P. W. Jordan and R. Jensen, editors. MacMillan, New York p. 162-228. 10. FAO - UNESCO (1994). Soil map of the world. Revised legend with corrections. Technical paper No. 20, ISRIC, Wageningen, 139 pp. 11. R. (1978).

1995). All are found in rather sandy soils (Table 1). Table 1. Range of variation of some characteristics of the top-soil ofTerfezia productive fields. 5 In several countries there are legends connecting truffle appearance to thunder storms early in the season. The Beduins in the Israeli Negev tell the same story as truffle hunters in Morocco (Kagan-Zur, personal observations). The only proven fact is that desert truffles yields in the wild are Varda Kagan-Zur 50 highly dependent on rainfall and rain distribution during the rainy season, though as little as 200-250 mm per season may bring about a good yield.

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