Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

LONG-TERM CORN PRODUCTIVITY AND COMPOSITION AS A FUNCTION OF PHOSPHORUS FERTILIZER AND RESIDUE REMOVAL (Pages : 18 - 23)

Management factors are extremely important for crop production. A long-term field study was established to determine the effect of crop residue removal and P applications on crop productivity and composition. Stover and grain yields were not affected by P applications until seventh year of the study. In that year, stover yields were significantly greater at 7.3 kg P/ ha compared to 0 or 29.4 kg P/ ha, while grain yields at the non-zero P rates were significantly higher than yield at the zero P treatment. In last three years of the study, significant differences occurred in whole plant (V6) dry matter yields with increasing V6 yields with increasing P rates. Total P uptake also increased with increasing P rates when significant differences were observed in total P uptake. Total C and N were not influenced by P rates at either soil depth. Residue treatments did not affect stover, and grain yields while the effect on V6 dry matter yields and total P uptake was variable. At 0-15 cm organic C content in last two years was significantly higher for residue retained. Six years of residue removal significantly decreased soil organic C content at 0-15 cm soil depth, but organic C did not differ between residue treatments at 15-30 cm. Total N content was not affected by residue treatments except in seventh year. In this year a higher total N content was observed with residue retained compared to residue removed.Download