高产条件下大葱干物质积累和养分吸收规律的研究

在高产地块设6个施肥处理研究了“万新1号”大葱的干物质积累和养分吸收规律。大葱由定植到缓苗越夏期干物质积累最慢,假茎充实期到收获期,干物质累积速度最快,直至收获干物质一直处于累积状态。大葱对氮磷钾吸收量分别是:116.92、45.92和94.50 kg/hm2,吸收比例为1∶0.39∶0.81。大葱从定植到缓苗越夏期日均积累干物质量为6.90 kg/(hm2.d);从缓苗越夏期到葱白充实期日均积累量为46.30 kg/(hm2.d);从假茎充实期到收获期干物质的日均积累量为127.4 kg/(hm2.d)。定植到缓苗越夏期养分日均吸收最低,假茎充实期到收获期磷钾养分日均吸收最高,假茎充实期与缓苗越夏期相比氮的吸收量有所降低。

Study on the Dry Matter Accumulation and Nutrient Uptake of Chinese Onion

The experiment was conducted in Zhangqiu county,Shandong province,the famous region for Chinese onion production.The experiment was designed 6 treatments of fertilizer to study the accumulation of dry matter and nutrient uptake of Chinese onion.The results showed that the accumulation rate of Chinese onion dry matter was the lowest from filed planting to over summer period.The accumulation rate of Chinese onion dry matter was the highest from cauloid richen to harvest.The onion accumulated dry matter from 6.90 to 127.4 kg/(hm~2·d) from planting to harvest.The uptake ratio of N∶P_2O_5∶K_2O was 1∶0.39∶0.81.And the uptake contents of N,P_2O_5 and K_2O were 1.78 kg,0.70 kg and 1.44 kg respectively from soil to produce 1000 kg fresh Chinese onion.