缓释砂硒对绿甘蓝富硒作用及生长的影响

砂硒因沙子具有透气保水的特性,同时硒释放相对缓慢,能提供稳定的硒来源,是比较理想的富硒蔬果培养基质。为了探讨缓释砂硒对绿甘蓝富硒作用和生长的影响,该研究设置对照组(CK),实验组缓释砂硒(CT)、鸡粪和砂硒1∶1混合(CT1)、鸡粪和砂硒1∶2混合(CT2)和鸡粪(CT3) 5个处理。结果表明:CT、CT1和CT2处理的绿甘蓝硒含量比CK分别增加45%、61%和64%,逐步回归分析表明绿甘蓝硒含量和土壤硒含量呈显著正相关(P<0.05); CT2处理的效果最好,绿甘蓝的产量增加45%,叶片厚度增加22.78%,水分利用效率提高56.66%。土壤锰含量和硒含量共同解释了绿甘蓝生物量变化的72%,而土壤锌含量解释绿甘蓝水分利用效率变化的66%。这表明砂硒添加后,通过增加土壤硒含量提高绿甘蓝硒含量,砂硒和鸡粪配比更有效地提高了绿甘蓝硒含量并促进其生长。

Effects of slow-released sand selenium on selenium enrichment and growth of green cabbage

Natural sand selenium(Se)is a readily available product which is air permeable and watertight. It is a kind of good matrix for producing Se enrichment plant. In order to test the efficiency of sand Se in cultivating green cabbage and provide Se as a nutrition source, we set five groups of experiments: CK(control group without fertilization), CT(natural sand Se), CT1(chicken manure:Sand Se=1:1), CT2(chicken manure:sand Se=1:2), CT3(chicken manure). The results showed that sand Se addition significantly increased Se content of green cabbage by 45%, 61% and 64%. Compared with the CK and CT3 groups, the yield, leaf thickness and water use efficiency of the green cabbage in CT2 increased significantly by 45%, 22.78% and 56.66%, respectively. Soil manganese and zinc content accounted for 72% variation of the green cabbage biomass and soil zinc accounted for 66% variation of the water use efficiency. These indicate that sand Se, particularly when mixed with chicken manure, not only can provide Se as a nutrition but also is beneficial to green cabbage yield.