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The Compost Manufacturer’s Manual

Fifty years before the soil foodweb became in the 1990s, Pfeiffer was using microscopes, preparing microbial inoculants, making superior quality composts, teaching farmers how to employ biological farming practices to improve soil organic matter, soil structure, and soil fertility – which in modern times is known as “soil health” -- and conducting cutting edge research on soil fertility, soil biology, soil humus, and food quality. 
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Available calcium a factor in salt balance for vegetable crops

Observations made on vegetable farms in New Jersey located on sandy soils, show that pH is not always a reliable indicator of the available calcium and that many of those sandy soils which have pH values of 6.0 to 6.6, where large applications of soda and potash have been made, may be very deficient in calcium and magnesium.
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