土壤不同供硼水平对红三叶草吸收其它营养元素的影响

THE INFLUENCE OF BORON ON NUTRIENT UPTAKE IN RED CLOVER ( TRIFOLIUM PRATENSE L. )

用石灰性紫色土盆栽红三叶草,研究了土壤缺硼(0.13ppm)、适量硼(0.75ppm)和高硼(5.0ppm)对红三叶草吸收K、Ca、Mg、P、Mn、Zn、Cu和Mo等养分的影响。结果表明,随着供硼水平的提高,上述诸元素的单株吸收量相应增大,但其增加的幅度则因元素种类、生育期不同而有差別。按红三叶草体内的元素浓度计,则有相反的趋势。缺硼明显抑制红三叶草对K等元素的吸收,高硼则无明显的影响。计算各种元素的平均吸收速度的变化规律,证明与红三叶草的平均生长速度的变化规律一致。根据上述结果,作者提出评价硼对养分吸收的影响,应综合考虑养分浓度、吸收量和吸收速度。

The influence of boron on the uptake of K, Ca, Mg, P, Mn, Zn, Cu, and Mo in red clover was studied under soil culture condition. Boron levels were 0.13, 0.75 and 5.0ppm. In all growth periods, the amount of K, Ca, Mg, P, Mn, Zn, Cu, Mo per plant was evidently increased by B application, but the concentration of these elements in above-ground parts ( except Mn ) and in roots ( except Mg and Zn ) decreased. B also increased the mean uptake rate of all 8 nutrients ( especially during the period from stem developing to full flowering ) and the degree of the increase varied with nutrients.B toxicity did not affect either nutrient uptake or accumulation in red clover.