桐油控释复合肥配比性质及对烟草吸钾特性影响的研究

Property of Tung oil Controlled Release Composite Fertilizer and Its Effect on Absorbing Potassium in Tobacco leaves

以桐油为控释材料,对氮、磷、钾复合肥三种配比形式进行控释,采用盆栽试验,对控释复合肥养分释放动态和对烟草叶片吸钾特性进行研究.结果表明:在红壤中,桐油控释复合肥初期溶出率为0,比普通复合肥初期溶出率下降12.6%,以[(硝铵+尿素各50%)+磷酸钙+硫酸钾,m(N)∶m(P2O5)∶m(K2O)=1∶1.13∶2.61]配比组合最佳,该控释复合肥使烟草叶片含钾量提高率比普通复合肥提高12.4%.施桐油控释复合肥是提高烟草叶片含钾量和品质的一种新的途径.

Tung oil is used as controlled material to produce the N, P and K controlled release composite fertilizer. Soil incubation experiment is carried out to study the dynamic rate of nutrient released from the composite fertilizer and the absorbing property of the potassium in tobacco leaves. It is shown through the result that the preliminary solubility rate of controlled release composite fertilizer is 0% in the soil ,which is decreased by 12.6% compared with the preliminary solubility rate of common composite fertilizer. The best ratio of the composite fertilizer is [ （ ammonium nitric ＋ carbamide each 50% ） ＋ calcium phosphate ＋ potassium vitriol, m （N） ： m（P2O5）：m（ K2O） = 1：1.13：2.61 ]. By using the controlled release composite fertilize, the potassium in tobacco leaves is increased by 12.4%. It is concluded that the controlled release composite fertilizer with tung oil used as a controlled material is a way to increase potassium in tobacco leaves and tobacco quality.