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material information title: aridity and man; the challenge of the arid lands in the united states series title: american association for the advancement of science publication.nitrogen fertilizers: characteristics, groups, benefits,nitrogen fertilizers: characteristics, groups, benefits for plants, fertilizing the most important source of nitrogen in plant nutrition, first of all, is the soil itself. plant availability.microbial communities in pesticide-contaminated soils in,light sierozem soils: these soil types are formed by vegetation from the ephemeral desert steppes. parent rocks are loess-like loams. the climate of this zone is continental. in summer, the air temperature can reach up to 43 °С, and in winter down to 25 °С. mechanical composition is silt-loam, sandy loam, and loamy loess. humus content 0.7
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