Soils and fertilizers . in a ton of the green crop, when in a con-dition to plow under, is as follows: Table 55. — Quantities of Nitrogen in Some LeguminousGreen-Manuke Crops Chop NitrogenPER Ton,Pounds PkobableYield pesAche, Tons 10 6 9 6 10 5 14 8 8 6 10 6 11 5 Nitrogen PEB Acre, PorHDB Red or mammoth cloverCrimson clover . .Alsike clover .... Alfalfa Cowpeas Soy beans Canada field peas . 605450112486055 GREEN-MANURES 237 Not all of the nitrogen contained in these crops is takenfrom the air. On soils rich in nitrogen, a considerable pro-portion may be obtained from the soil. On poor soils, t
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Soils and fertilizers . in a ton of the green crop, when in a con-dition to plow under, is as follows: Table 55. — Quantities of Nitrogen in Some LeguminousGreen-Manuke Crops Chop NitrogenPER Ton, Pounds PkobableYield pesAche, Tons 10 6 9 6 10 5 14 8 8 6 10 6 11 5 Nitrogen PEB Acre, PorHDB Red or mammoth cloverCrimson clover . .Alsike clover .... Alfalfa Cowpeas Soy beans Canada field peas . 605450112486055 GREEN-MANURES 237 Not all of the nitrogen contained in these crops is takenfrom the air. On soils rich in nitrogen, a considerable pro-portion may be obtained from the soil. On poor soils, theproportion derived from the atmosphere is considerablylarger. Soils needing nitrogen most are those that benefitmost largely from its application. 296. Transfer of plant-food materials. — There is a trans-fer of plant nutrients in a double sense: (1) removal of these LOaS lAfl6ELY OnSANIC / ^. WITH SOME N1TR06ENAND PHOSFHOniC ACID LARGE L035 Of OReANIC -^MATTER, NITROGEN, PHOS-PHORIC ACIO AND P0TA5H .TO MARKET. GREEN MANURE Fia. 34. — Movements of plant-food materials. After absorption by theplant they may be returned in whole or in part to the soil. If grain andstraw or hay are sold nothing but the stubble and roots are returned. Iffad to animals, part may be returned in the manure. If plowed under asgreen-manure, all are returned. substances from combination with other minerals and theirconversion into combinations with organic matter; (2) re-moval from lower soil by absorption by roots and the deposi-tion of this material in the upper layer of soil when the plantdies and is plowed under. The first of these transfers resultsin an improved condition of the plant nutrients, because inthe combinations with organic matter they are in generalmore available to plants than when in combinations with 238 SOILS AND FERTILIZERS inorganic matter. By the second form of transfer the nutri-ents in this available form are deposited in the upper soil fromwhich most crops draw the larg