Soil Micromorphology by International Working-Meeting on Soil Micromorphology 1988

By International Working-Meeting on Soil Micromorphology 1988 San antoni

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Fine material. The crystals include abundant The lenticular crystals are unoriented but their distribution is in association with the layers of fine material. tions related gypsum The layers do not have undula- to the gypsum crystals. 7. Size particles distribution The materials gathered in the pipes range from 5 to 30 um (70-40%) and from 20 to 50 pm (15-25%), the sand fractions are also quite different: ceramic versus 12% in PVC (Table 1). 20-30% in Coarse materials (0<3mm) are found the ceramic pipes in contrast with fine material inside (0<1mm) in the PVC drains.

20 A r o o t a l m o s t c o m p l e t e l y r e p l a c e d b y j a r o s i t e surrounded b y c l u s t e r s o f u m c r y s t a l s and a s m a l l r e s i d u e o f t h e r o o t . F i g . 2 1 Numerous s m a l l r o o t s occupying t h e c e n t r a l p a r t o f a bracken rhi-he e p i d e r m i s o f which i s now fragmented. 'A' i s shown i n F i g . 22. F i g . 22 The a u t o f l u o r e s c e n c e o f s m a l l r o o t s a t 'A' i n F i g . 21. F i g . 23 P a r t m e c o m p o s e d r o o t surrounded b y an i r o n - p i p e .

The micromorphometric summarized soils to findings with respect to intrapedal pores are in Table 2 and Figures 1 and 2. Figure 1 compares porosity between taken from nonploughed land (columns 1, 3 and 5) and horizons subjected traditional tillage methods (columns 2, 4 and 6 ) from profiles 1, 2, 3 and 5. In soils 4 and 6, porosity in nonploughed and traditionally tilled samples is shown in columns 1 and 3 , and 2 and 4 respectively. In profiles 1 and 5, intrapedal porosity soils. By was higher contrast, profile clay, showed greater in nontilled than in traditionally tilled 6, illustrating material developed upon Keuper intrapedal porosity in ploughed soils.

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