喷Ca对木奈果实含Ca量及果肉褐变的影响

喷施Ｃａ肥可提高果实含Ｃａ量，以盛花后２、６、１０周连续喷Ｃａ效果最佳，盛花后２周喷Ｃａ其次．Ｃａ可抑制果肉ＰＰＯ活性，减少酚类物质含量和降低细胞的膜透性；２、６、１０周连续喷Ｃａ可有效防止木奈果实褐变．

含Ca、Ba合金中氧的测定

研究了利用TC-436型氧氮联测仪控制含Ca、Ba合金中的氧化物含量,通过测定合金中[O]含量间接确定氧化物含量,以此更准确地评价合金的质量。通过条件试验,优化了仪器的工作条件。

Effect of Initial Soluble Salt Composition of Saline Soil on Salinity Tolerance of Barley Plant

A pot experiment was carried out on a marine saline soil to study the effect of initial soluble Na/Ca ratio of saline soil on the salinity tolerance of barley plant.The results showed that (1) the Na/Ca ratio affected significantly the dry weight of the plant at an earlier stage of growth,the critical values of initial Na/Ca ratio at which the plant could grow normally on soils containing salts of 2.5,3.5 and 4.5g kg^-1 were 30,20 and 15,respectively;(2)smaller Na/Ca ratio resulted in a considerable decrease in Na accumulation but a great increase in K accumulation in the barley plant;and (3) the plasmallema of barley leaf were badly injured when the Na/Ca ratio was more than 30 and the increase of Na content of plant caused an exudation of K from the leaf cells.Some critical indexes were suggested for the cultivation of barley plant on marine saline soils and could be used as reference in the biological reclamation of marine saline soils.

喷射沉积挤压态镁合金的热压缩变形行为

以喷射沉积技术制备Mg-9Al-3Zn-1Mn-6Ca-1Nd合金的沉积坯,对其进行挤压变形和热压缩变形,重点研究了挤压态镁合金的热压缩变形行为和组织演变。结果表明,挤压态镁合金为α-Mg和微米级"含Nd的Al2Ca相"的双相组织;当应变速率一定时,流变应力随温度的升高而降低,当变形温度一定时,流变应力随应变速率的增大而增大。当温度和应变速率一定时,Mg基体的轴比(c/a)随变形程度的增加而降低,"拉压不对称性"得到改善。