共 50 条
- [1] FACTORS INFLUENCING CORN FERTILIZER N REQUIREMENTS IN THE NORTHERN UNITED-STATES CORN BELT [J]. JOURNAL OF PRODUCTION AGRICULTURE, 1990, 3 (04): : 527 - 534
- [2] FROM CORN BELT OF UNITED-STATES - PRODUCTION AND PROTECTION OF HYBRID SEEDS [J]. AGRICULTURA DE LAS AMERICAS, 1977, 26 (08): : 30 - &
- [4] RIDGE TILLAGE SYSTEMS IN THE CENTRAL UNITED-STATES CORN-BELT [J]. AGRICULTURAL ENGINEERING, VOLS 1-4: LAND AND WATER USE, AGRICULTURAL BUILDINGS, AGRICULTURAL MECHANISATION, POWER, PROCESSING AND SYSTEMS, 1989, : 2729 - 2736
- [6] HETEROTIC PATTERNS AMONG UNITED-STATES CORN BELT, YUGOSLAVIAN, AND EXOTIC MAIZE POPULATIONS [J]. MAYDICA, 1989, 34 (04): : 353 - 363
- [7] PREDICTING SOIL TEMPERATURES UNDER A RIDGE FURROW SYSTEM IN THE UNITED-STATES CORN BELT [J]. SOIL & TILLAGE RESEARCH, 1990, 18 (2-3): : 145 - 165
- [8] SWINE PRODUCTION IN THE CORN BELT OF THE UNITED STATES [J]. ECONOMIC GEOGRAPHY, 1936, 12 (04) : 359 - 372