有机肥与尿素配施对设施土壤盐分含量与组成变化的影响

通过室内模拟培养试验，研究了有机肥与尿素配施对设施土壤盐分的影响。结果表明：（1）设施土壤的含盐量和电导率均随着施肥后培养时间的延长，呈先升高后降低再升高的趋势，培养15～30d较高，30—60d降低，60d后又缓慢升高。设施土壤含盐量与有机肥施用量呈极显著正相关，而与尿素用量无明显的相关性；电导率则与尿素和有机肥施用量均有极显著正相关。（2）施用尿素不同程度增加了K＋、Na＋、Ca2＋、Mg2＋,NO3-的含量，施用有机肥显著增加了K＋、Na＋、Cl-的含量，设施和露地土壤盐分总量和离子组成差异不显著。另外研究了土壤盐分总量和电导率分别与K＋、Na＋、Ca2＋、Mg2＋、SO4^2-、Cl-等含量的相关性，均呈极显著正相关。

Effect of Interaction Between Manure and Inorganic Fertilizers on Salt Content and Ion Composition in Greenhouse Soil

Absorption of crops, nutrient efficiency and salt accumulation of soils were great influenced by interaction of different nutrition or soil salinity ion.It is very important to study the influences of interaction of several fertilizers concurrently in soils on salt content and ion composition for enhancing fertilizer use efficiency and regulating nutrient balance and salt content in greenhouse cultivation system. Thus, in this research, the effects of interaction between inorganic fertilizers and manure on salt content and ion composition in greenhouse and open field soil of Shuangliu in Sichuan Province were studied in an incubation experiment. The results showed that： （ 1 ）Salt content and EC in greenhouse soil changed in the same way as that in open field, EC were significantly related to salt content, they were first increased in the begin- ning 30 incubation days, decreased during 30 and 60 incubation days, then increased again after 60 days. A significant relationship was found between salt content and manure amount; however, salt content and urea fertilizer amount did not show much. EC were significantly correlated with both manure amount and urea fertilizer amount.（ 2 ）K＋, Na＋, Ca2＋, Mg2＋, NO; content were differently increased after urea application, and K＋, Na＋, Cl- content were significantly increased after manure application. There were no significant difference between salt content and ion composition in greenhouse soil and that in open field soil. Both salt content and EC correlations with K＋, Na＋, Ca2＋, Mg2＋, SO4^2-, Cl- content were also discussed, results were significant.