SOIL

(See also Agriculture; Conservation; Farms; Fertilizers)

bacteria: g76 3/22 25-26; g73 3/8 10; g73 7/8 7; g70 1/22 4; g66 1/22 20-21; g64 4/8 16; g61 9/8 22

clay: g74 5/22 10

deficiencies: g67 2/22 21, 23-24; g65 9/8 17; g50 12/8 9-12

discussion: ce 138-140; g75 8/8 12-15

earthworms: lp 91-93; g77 10/8 31; g76 11/8 21-22; g75 8/8 14; g72 10/22 7; g70 3/8 19; g66 1/22 21; g62 1/22 11; g61 9/22 16

erosion: g81 4/22 4-5; g80 3/8 21-24; g74 5/8 29-30; g69 11/22 23; g63 1/22 26; g63 3/22 21; g63 6/8 20-23; g56 4/8 13; g50 11/22 10; g50 12/22 5; g48 8/8 21-22; g45 10/24 31

topsoil lost annually: g85 6/22 31

fertilizers: g77 10/22 20; g76 7/8 30; g75 8/8 13-15; g74 5/22 10-11; g74 12/22 31; g73 11/22 20; g71 10/22 29-30; g70 4/8 20; g69 11/22 20-22; g67 2/22 21-24; g66 1/22 23; g65 9/8 17-19; w64 128; w62 295; g61 9/8 22; g61 9/22 30; w57 92; g57 2/8 16; g50 11/22 8-12; g50 12/8 10-11; g47 11/22 21-23; g35 2/13 314; g35 4/24 470

insecticides’ effect: g81 12/8 30

insects: g72 2/22 12; w71 326-327; g71 5/22 17-18

number per square foot: g76 3/22 25

termites aid fertility: g58 7/8 16

leaching: g65 6/22 9

living creatures: g62 7/22 18

loam: g74 5/22 10

marvel of design: ce 138-140; w78 7/15 9-10

microorganisms: g72 2/22 12

mixed culture: g71 5/22 17-18

nitrogen fixation in: ce 135; g77 10/22 20; g70 4/8 20; w67 39-40; w62 295; g61 9/8 21-22

permafrost: g60 1/8 9-12

pollution: g71 4/22 11-12; g68 11/22 12-14; g66 6/22 30

sand: g74 5/22 10; g66 7/22 9-11

snow’s effect: g85 3/8 21; g61 1/22 11; g58 2/22 23

symbolic: w80 6/15 12-15, 17-22; w70 15; yb70 15-16; w62 19; yb62 29-30; w57 89-90; w53 350; w52 229; w51 655; g51 9/22 25-26; w50 483-484, 487-492

varies in chemical properties: w80 6/15 20-21