Studies Of Combined Appliacation Of Nitrogen And Phosphorus On Aloe Vera Under 30% Seawater Irrigation And Its Response To Nitrogen And Chloride

The repressive mechanism of salt stress on plant growth is very complicated. The effects vary in different organs of the same plant, different staged plants, different suffering time. There is a considerable discrepancy among the proposed mechanisms. Field experiments have proved the capability of resisting salt stress caused by 30% seawater of aloe. Based on the experimental results obtained, we studied the effects of different application amounts of nitrogen and phosphorus fertilizer on growth, content and distribution of ions in Aloe vera under 30 % seawater irrigation. Both field and pot experiments were carried out to investigate the effects of nitrogen, chloride application amount on growth and quality of Aloe vera. The results showed that:Under 30% seawater irrigation, the maximum leaf yield of one year old Aloe vera of 26015 kg-hm^-2 calculated from the regression equation occurred when the application amounts of nitrogen and phosphorus reached 141.9 kg·hm^-2 and 84.0 kg·hm^-2 , respectively. At the same rate of phosphorus, the single leaf weight of Aloe was increased with the increase of N application, while the greatest single leaf weight was found within the phosphorus supply between 84 to 105 kg·hm^-2 when the same amount of N fertilizer was applied.Within N application of 138 kg·hm^-2 and P₂O₅) application of 84 kg·hm^-2, the leaf yield and single leaf weight were increased by increased amount of N and P application, with the greatest increase of 109 %,52 % respectively. And the combination of N of 138, 172.5 kg·hm^-2 with P of 84 kg·hm^-2 had greater weight of unit leaf, higher content of anthraquinon and aloin. Therefore the best combination was N2P2, and N3P2 take the second place.The co-provision of N and P fertilizer helped to increase the leaf anthraquinon content...