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Soils and Their Management
Crop Requirements and Nutrition
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advantage amount aphids applied areas basic beans biological control brassicas buildup Calcium carrots cause problems celery Chapter chemicals clay soil compost considered cooperative damage deficiency droplet effect enable ensure farm shops farmers market farmyard manure fertilizers floating films fruit glass green manures greenhouse grower growing grown harvest Herb herbicides holding horticultural ideal important infected irrigation leeks legumes lettuce levels lime liquid feed machine magnesium major modern market garden nitrogen normally nutrients occur onions organic matter Otley College outlet P.O. Box packaging particles pest pests and diseases phosphate planning plant poly-tunnel polyethylene possible potash potassium predator prevent produce range of crops red spider mite reduce retail root rotation Rototiller sand seed seedbed silt soil profile soil structure soil texture soil type space spray sprayer subsoil sulfate supply tomatoes topsoil tunnels varieties vegetable ventilation weed control whitefly wholesaler wide range