不同施氮量对饲用燕麦光合特性及氮素光合利用效率的影响

Effects of Different Nitrogen Application Rates on Photosynthetic Characteristics and Nitrogen Photosynthetic Utilization Efficiency of Fed Oats

为探明不同施氮量下饲用燕麦在晋北地区光合特性及氮素光合利用效率的差异,以4个国内外具有代表性的饲用燕麦品种为试验材料,研究其生物产量、光合特性及氮素光合利用效率的变化特点。结果表明,4个参试品种的干草产量均随着施氮量的增加呈递增趋势,均在施氮量180kg/hm^(2)时最高;随着施氮量的增加,各品种净光合速率和氮素光合利用效率呈持续增加的趋势。综合各项指标可知,晋北地区蒙燕1号、甜燕麦、KONA和坝燕7号4个燕麦品种生产时,田间施氮量可控制在180kg/hm^(2)水平。

In order to explore the differences of photosynthetic characteristics and nitrogen use efficiency of fed oats under different nitrogen application rates in northern Shanxi province,four typical forage oat varieties were used as experimental materials to study the biological yield,photosynthetic characteristics and nitrogen photosynthetic efficiency.The findings indicated that hay yields of four varieties increased with the increase of nitrogen application rates,and the nitrogen application rate of 180kg/ha produced the maximum hay yields.Net photosynthetic rate and nitrogen photosynthetic utilization efficiency both grew steadily with the increase of nitrogen application rate.The amount of field nitrogen application could be regulated at 180kg/ha during the production of Mengyan No.1,Sweet oats,KONA,and Bayan No.7 in northern Shanxi province according to the complete indicators.