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The Soils of the Earth Planet and Man Activities V A Kovda
Reflexions Sur Le Concept De Productivite Des Sols S Henin
Role De La Fertilisation Dans Laccroissement De La Productivite Des Sols
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acid acre added agriculture ammonium sulphate amount analysis application average basic slag Bonemeal calcium canes capacity carbon cent chemical clay Coal combined composts containing Control countries crop crop production cultivation depth dose effect efficiency energy experiments factors fertiliser fertilizers field fixed forest given glucose grain grass greater growing grown growth hectare Hence higher important improved increase India inoculation irrigation kg/ha land less light lignite lime loam loss manure materials mean method mineral mixed moisture natural nitrogen nitrogen fixation nutrients observed obtained organic matter oxidation paddy period phosphorus plant plots practices present production protein ratio reported response rhizosphere rice rock phosphate roots saline sandy soil surface Table tion treatments Urea varieties vegetative Water hyacinth Wheat straw yield