不同施硼方式对枳橙砧木生理生化特性的影响

以枳橙砧木为试验材料,设置根施与叶施2种施硼方式,研究不同施硼方式对枳橙砧木的农艺性状、干物质积累量、不同器官各元素(B、K、Ca、Mg)含量以及叶片中糖类、丙二醛(MDA)、脯氨酸(Pro)和叶片伤害率的影响。结果表明:叶施硼显著增加枳橙幼苗茎和叶的干物质质量、总干物质质量和株高,并促进根系的生长;叶片中的B含量提高126.5%,1.3%的B在茎中转移积累,但叶施硼使枳橙根部B含量降低11.1%;叶片中K、Ca、Mg含量均显著高于对照。根施硼各元素(B、K、Ca、Mg)含量均显著高于叶施硼处理(除叶片外);叶片中糖类、MDA、Pro含量和叶片伤害率在施硼后均下降。因此,叶施硼在维持叶片各元素平衡、糖类物质合成和提高叶片抗逆性方面有较好的效果,但叶施硼会降低根系硼含量、加重根系缺硼。

施硼对紫花苜蓿种子生产性能的影响

西昌亚热带暖温河谷区冬春干旱季节的光热条件可满足非秋眠级紫花苜蓿种子生产,是紫花苜蓿种子生产的可选区。对非秋眠级紫花苜蓿进行现蕾期叶面施硼和现蕾期、花期叶面施硼处理,结果表明,二次叶面施硼组好于1次施硼组,产种量253.5 kg/hm2,比对照组增产19.5 kg/hm2,生殖枝比例也较高,占50.83%,有一定的增产效果,但施用方法有待进一步研究。

Response of Yield, Yield Components and Fiber Properties of Cotton to Different Application Rates of Nitrogen and Boron

Nitrogen （N） was applied at rates of 0, 100, 200 and 300 kg.ha^-1 and boron （B） was applied as foliar at rates 0, 500 and 1000 g.ha^-1 to study the effect of different application rates of nitrogen and boron fertilizers on yield, yield components and fiber properties of cotton. Statistical results of study showed that N application significantly （P 〈 0.05） enhanced boll number, boll weight, seed cotton weight of boll, seed cotton yield and lint yield. Results of study also indicated that the maximum seed cotton yield was recorded in case of 200 kg.ha^-1 N application rate, and this application rate resulted in 19.6% increased seed cotton yield. Statistical results also indicated that foliar application of B significantly enhanced boll number, boll weight, seed cotton yield and lint yield. Results also demonstrated that the maximum seed cotton yield was obtained in case of 1000 g.hal foliar application of B, and this foliar application rate resulted in 25% increased seed cotton yield. Statistical results showed that effect of different application rates of N was not significant for all fiber properties （fiber length, fiber strength and fiber fineness）. Conversely, results of study indicated that different application rates of B significantly affected some fiber properties.