By William H. Burt
Descriptions of 380 species comprise dimension, weight, colour, markings, variety of enamel, habitat, conduct, and comparisons with comparable species. very good colour illustrations and line drawings express 230 animals. diversity maps in addition to pictures of skulls and drawings of animal tracks, dens, nests, and burrows around out the wealth of knowledge given in "the most sensible basic consultant to all of North America" (Peter Warshall, complete Earth Review).
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Additional info for A Field Guide to Mammals: North America north of Mexico (Peterson Field Guides)
4 and show similar species differences to those in ash concentration. 3. Mean colostrum yield and mineral concentrations in colostrum of 21 cows shortly after parturition (Kume and Tanabe, 1993). Time after parturition (h) Colostrum yield (kg dayϪ1) Ca (g lϪ1) P (g lϪ1) Mg (g lϪ1) Na (g lϪ1) K (g lϪ1) Fe (mg lϪ1) Zn (mg lϪ1) Cu (mg lϪ1) Mn (mg lϪ1) SD, standard deviation. 4. Mineral concentrations in the main milk of farm animals (representative values). 05 – – Morin et al. (1995). phosphorus, potassium, chlorine and zinc, but is much less satisfactory as a source of magnesium, iron, copper and manganese.
The phosphorus concentrations in wheat, barley and oat grains from soils low in available phosphorus (P) are generally only 50–60% of those from more fertile soils, but they can be raised from 2–3 to 4–5 g P kgϪ1 DM by superphosphate applications, which, at the same time, increase grain yields. Trace element and sulphur fertilizers In some areas, small applications of molybdenum to deficient soils markedly increase legume yields and herbage molybdenum and protein concentrations. The increase in protein is usually advantageous to the grazing animal but the increases in molybdenum are of no value, except where copper intakes are high.
Wide variability in the mineral concentrations of pasture grass and legume seeds has also been observed in New Zealand (Sherrell and Smith, 1978), although some of this variability arises from soil differences. Effects of Soils and Fertilizers on Plant Minerals Mineral concentrations in plants generally reflect the adequacy with which the soil can supply absorbable mineral to their roots. However, plants react to inadequate supplies of available minerals in the soil by limiting their growth, reducing the concentration of the deficient elements in their tissues or, more commonly, reducing growth and concentration simultaneously.