不同氮肥施用量对白芦笋生育指数及产量和品质的影响

试验结果表明,不同施氮量对芦笋产量、品质、生育指数及根系等均有不同程度的影响,其中,施纯N 300 kg/hm2对3年生大田白芦笋的效果最显著,芦笋产量最高,Vc含量最高,生育指数也最大,但施氮量高于300 kg/hm2对芦笋根系有比较明显的抑制作用。施氮量(x,kg/hm2)与嫩茎总产量(y1,kg/hm2)和一级笋数(y2,个/hm2)分别呈以下线形关系:y1=2 004.5 x+3 780(R2=0.921 2),y2=576.3 x+1 389.8(R2=0.929 7)。推荐300 kg/hm2纯氮施用量作为同类地区芦笋施氮量的参考指标。

Effect of Nitrogen Application Rates to Growing Index, Yield and Quality of White Asparagus

The result of the test of nitrogen application rates to white asparagus shows that the application rates of nitrogen to asparagus has the varying degree influence on the yield, quality, growth index and root system. Applied pure nitrogen of 300 kg/hm2 to the white asparagus growing for three years in field the effect is remarkable, the yield is the highest, the Vc content is the highest and the gorwth index is also the biggest. However if the application of nitrogen is higher than 300 kg/hm2, to the root system would have a obvious inhibitory effect. Nitrogen fertilizer application amount （x, kg/hm2） , the asparagus total yield （y,, kg/hm2） and the superior asparagus＇ quantity（y2, pce/hm2） reveal such linear relations respectively, y1=2 004.5 x＋3 780（R2=0.921 2）,y2= 576.3 x＋1389.8 （R2=0.929 7）. Therefore it was recommended 300 kg/hm2 as a norm of nitrogen fertilizer application amount in the similar area.