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Subjects Soil productivity Remove constraint Soil productivity: Soil productivity Collections Organic Roots Collection Remove constraint Organic Roots Collection: Organic Roots Collection
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1. A study of the value of crop rotation in relation to soil productivity

Author:
Weir, Wilbert Walter , 1882-
Subject:
Crop rotation , Soil productivity , crop rotation , fertilizers , yields , crop yield , crop production , soil productivity , long term experiments , research methods , land management , soil management
Physical description:
68 p. : ill. ; 23 cm.
Additional Author(s):
Weir, Wilbert Walter , 1882-
Collection:
Organic Roots Collection

2. Renovation of worn-out soils

Author:
Spillman, W. J. (William Jasper) , 1863-1931
Subject:
Soil management , Soil productivity , soil , soil amendments , soil degradation , soil conservation , soil quality , soil fertility , soil erosion , land restoration , green manures , soil organic matter , soil exhaustion
Physical description:
16 p. ; 23 cm.
Additional Author(s):
Spillman, W. J. (William Jasper) , 1863-1931
Collection:
Organic Roots Collection
Series:
Farmers' bulletin

3. Soil productivity as affected by crop rotation

Author:
Weir, Wilbert Walter , 1882-
Subject:
Soil productivity , Crop rotation , crop yield , crop rotation , cropping systems , soil productivity , soil fertility , soil quality , soil management , tillage , intercropping , legumes , cropping sequence , plant cultural practices , crop management , cover crops , grain crops , green manures , soil conservation , fertilizers , soil
Physical description:
22 p. : ill. ; 23 cm.
Additional Author(s):
Weir, Wilbert Walter , 1882-
Collection:
Organic Roots Collection
Series:
Farmers' bulletin