Drainage and Nutrient Effects in a Field Lysimeter Study: I. Corn Yield and Soil Conditions
1969
Lal, R. | Taylor, George S.
The effects of constant water table (WT) depths, intermittent flooding, two N and two micronutrient (Zn and Cu) levels on corn (Zea mays L.) yields were studied in field lysimeters containing Miami silt loam soil. Constant WT depths were 15 and 30 cm as compared with no WT. Intermittent flooding treatments were 48- and 96-hour periods of weekly flooding for 3 consecutive weeks. All drainage and nutrient treatments had significant and independent effects on corn grain yields. Application of N, Zn and Cu did not offset the detrimental effects of inadequate drainage. Ear leaf concentrations of N and Zn were more significantly correlated with grain yield at lower levels of N and Zn application than at higher ones. Correlation coefficients between grain yield and soil oxygen and between yield and soil carbon dioxide were 0.68 and −0.63, respectively. Soil temperatures at high WT levels were 5 and 6C lower than in well-drained lysimeters.
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