膜材料及其构成对调节控释肥料养分释放特性的影响

试验采用水溶出率实测法研究了自行研制的控释肥料养分释放的特性。以养分释放速率和释放期为主要指标评价了膜材料及其构成对调节控释肥养分释放特性的影响。结果表明,膜材料M2的控释性能优于膜材料M1;用膜材料M1包膜肥料的养分累积释放曲线呈对数曲线,而用膜材料M2包膜肥料的养分累积释放曲线呈直线型。在膜的比面重(单位肥料面积上所含膜材料的重量)为20～80g/m2范围内,随着比面重的增加,包膜肥的初期溶出率降低,释放期延长;通过调节膜材料组成与比面重可以研制出释放期不同的控释肥料。

The effect of coated materials and its structure on the release properties of controlled release fertilizers

The method "dissolution rate in water" was used to study the release properties of controlled release fertilizers. Nutrients release rate and release duration were used to assess the effect of coated materials and its structure on the release properties of controlled release fertilizers. The results suggests, coated materials M2 was better than coated materials M1 in controlling nutrients release rate. The nutrients cumulative release rate curve of controlled release fertilizers coated by material M1 was logarithm, otherwise the nutrients cumulative release rate curve of controlled release fertilizers coated by material M2 was straight line. With RWA (ratio of coated materials weights and fertilizers area) increasing in the range of 20-80g/m², the nutrients preliminary solubility decreased and the release duration was longer. The fertilizers with different release duration could be made through adjusting coated materials and RWA.