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Interpretive Summaries:
Potassium cycling in the soil/plant system with wheat, 1995
The combination of crop management systems and higher yields has increased the potash requirements in wheat and maize production. Potash applications of 150 kg K2O/ha increased wheat yields by 350 kg/ha (7 percent) and maize yields by 447 kg/ha (5 percent). Retaining crop residues on the field increased the yields of both crops by an additional 2 percent. The highest yields attained occurred with the K plus straw treatment. Comparing K input/output balances, the ratio for the K treatment was 0.97 whereas the K plus straw treatment was lower at 0.85. Although the greatest K supply occurred with K plus straw, the higher yields which resulted from this improved management reduced soil K levels indicating that as yields are increased as a result of better management, additional potash fertilizer rates must be applied. NINGXIA-01
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