|
|
|
Interpretive Summaries:
2005 - Effect of Potassium and Magnesium on Rice Grain Yield in Coastal Peru
2004 - Effect of Potassium and Magnesium on Rice Grain Yield in Coastal Peru
2003 - Effect of Potassium and Magnesium on Rice Grain Yield in Coastal Peru
Effect of Potassium and Magnesium on Rice Grain Yield in Coastal Peru, 2005
Coastal Peru has potential for achieving high rice yields due to its favorable and sunny climate. Yields are higher than those in surrounding countries due to substantial use of nitrogen (N). However, a great deal of yield potential is lost because phosphorus (P), potassium (K), and magnesium (Mg) are inadequately supplied. In addition, the effect of imbalanced nutrition on rice crop quality has not been evaluated recently. Two sites at Pitipo and Vista Florida, in the rice production area of Chiclayo, were selected for testing 0, 37, 74, and 111 kg K2O/ha, and 0, 15, and 30 kg MgO/ha. Nitrogen and P were supplied in all treatments at 260 kg N/ha and 46 kg P2O5/ha.
In 2003, no significant differences in grain yield were found among treatments supplying fertilizer at both sites, however differences in grain quality were evident. The proportion of whole grain in the sample equaled 49% for the check treatment (0 K, 0 Mg) and 63% for the treatment supplying 37 kg K2O/ha plus 15 kg MgO/ha at Pitipo. At Vista Florida, the check sample had 43% whole grain while the treatment supplying 74 kg K2O/ha plus 30 kg MgO/ha had 46% whole grain.
During 2004, only the site at Vista Florida was planted due to the intense drought at Pitipo. Results indicate a significant response to increasing K rates across Mg rates as follows: 0 kg K2O = 9,592 kg/ha, 37 kg K2O = 9,716 kg/ha, 74 kg K2O = 10,023 kg/ha, and 111 kg K2O = 10,217 kg/ha. The interaction between K and Mg was evident in the percentage of undeveloped grain in the sample. The treatment supplying 0 kg K2O and 0 kg MgO had 12% undeveloped grain while the treatment supplying 111 kg K2O and 30 kg MgO had 8% undeveloped grain.
During 2005, the last year of the project, drought persisted and again only the site at Vista Florida was planted. In general, grain yields and treatments responses were lower than previous years due to the drought. Again, the interaction between K and Mg was evident in the percentage of undeveloped grain in the sample. The treatment supplying 0 kg K2O and 0 kg MgO had 19.7% undeveloped grain and the treatment supplying 74 kg K2O and 30 kg MgO had 15.1% undeveloped grain. Peru-02
|
|
