氮硫互作对玉米苗期生长及养分吸收的影响

通过设置盆栽试验,研究氮、硫养分互作对玉米苗期植株生长和养分吸收的影响。结果表明,氮素和硫素对玉米苗期的生长和养分吸收均有显著影响,且交互作用显著。高氮处理的株高、茎粗、SPAD值、净光合速率、干物质积累量和氮素积累量与不施氮处理相比分别提高48.7%、30.0%、28.3%、18.5%、47.4%和285.3%,低氮处理介于高氮处理和不施氮处理之间。施硫促进玉米生长,且氮硫交互效应显著。不施氮条件下,施硫显著提高植株干物质积累;低氮条件下,施硫促进玉米生长和氮素吸收;高氮条件下,施硫效果与低氮条件下接近。综合分析,高氮低硫处理获得较高的植株干重、最高的硫素利用率和较高的氮素利用率,是适宜玉米苗期生长的最佳氮硫养分管理措施。

Effects of Nitrogen and Sulfur Interaction on Growth and Nutrient Absorption at Maize Seedlings

The effects of nitrogen and sulfur interaction on plant growth and nutrient uptake in maize seedlings were studied by a pot experiment. The results showed that nitrogen application and sulfur application had an impact on the growth and nutrient uptake of maize seedlings, and interaction between the two was significant. The plant height, stem diameter, SPAD value, net photosynthetic rate, dry matter accumulation and nitrogen accumulation of N2 treatment were higher significantly than those of N0 treatment with different value of 48.7%, 30.0%, 28.3%, 18.5%, 47.4% and 285.3%, respectively. Furthermore, above parameter indexes of N1 treatment were lower than N2 treatment as well as higher than N0 treatment. Sulfur application significantly promoted the growth of maize seedlings, and showing interaction effect of nitrogen and sulfur significantly. Without nitrogen fertilization(N0), sulfur application significantly raised the dry matter accumulation of plant. Under low nitrogen condition(N1), maize growth and nitrogen uptake were promoted with sulfur application; Under high nitrogen condition(N2), the sulfur fertilization effect was similar to that of low nitrogen application. In conclusion, superior dry matter accumulation, the highest sulfur utilization and superior nitrogen utilization were observed in N2S1 treatment. Therefore, N2S1 fertilization is the most effective nitrogen and sulfur nutrition management measure for maize seedlings growth.