Search National Agricultural Library Digital Collections
Displaying
all 3 items
start over
- 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
- 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
- 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
