Effect of Nitrogen Level on Yield of Lactuca sativa
In order to investigate the effects of different fertilization treatments on growth and yield of Lactuca sativa,fertilization experiments were carried out in Songpan County.The results showed that different nitrogen levels had significant effects on the agro-nomic traits and yield of Lactuca sativa.The yield of Lactuca sativa increased to 4.79 cm and 0.96 kg per plant mass under 150 kg/hm2 nitrogen fertilizer,the yield was 99.46 kg/hm2,and the output value was 179.50 yuan/hm2.The yield increase was as high as 41.32%,but the plant height,diameter and individual plant weight of Lactuca sativa decreased slightly when nitrogen fertilizer was increased to 170 kg/hm2.
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