海水灌溉库拉索芦荟氮磷配施效应研究

采用田间小区试验研究了30％海水灌溉下1年生库拉索芦荟氮、磷两因素各五水平组合的效应，建立了芦荟叶片产量与氮、磷用量的回归方程。结果表明：芦荟叶片产量在施氮、磷肥量分别为N2～N3及P2～P3范围内取得最大值；通过计算，30％海水灌溉下2年生芦荟叶片的最高产量为Ymax=26015kg／hm^2，最高产量下氮、磷肥施用量分别为Nmax=141．9kg／hm^2、P2O5max=84．0kg／hm^2。在同一施磷水平下，芦荟单叶重均随着施氮量的增加而增加，但相同施氮量的各施磷组合芦荟单叶重在P2～P3为最大。和对照（不施氮磷肥）相比，氮磷配合施用显著提高了芦荟成熟叶片蒽醌含量，以N3P3处理下的叶片蒽醌含量最大，比对照处理增加23％。氮磷配合施用芦荟甙增产效果为5％～132％，施氮量为N3的各P处理组合芦荟甙含量为最大，显著高于No，N1和N4的各施磷组合；而增施磷肥则有利于在低施氮量（N0，N1）下提高芦荟甙含量。

Effect of Combined Application of Nitrogen and Phosphorus on Aloe under Sea Water Irrigation

A field experiment was conducted to study effects of different combination of nitrogen and phosphorus application on one-year old Aloe under 30; sea water irrigation. Regression equation of the leaf yield to the amounts of nitrogen and phosphorus application was estimated. The results obtained showed that the maximum leaf yield of Aloe was obtained within the nitrogen supply amount of N2 to N; and phosphorus of P2 to P;. Over application of nitrogen and phosphorus fertilizers can result in a decreasing trend in the leaf yield. The maximum leaf yield of 26 015 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 of Aloe was found within the phosphorus supply of P2 to P; when the same amount of N fertilizer was applied. Compared to CK, anthraquinon content in the mature leaf was increased by combined application of N and P fertilizers, with the greatest increases by 23 ; at N;P2. The co-provision of N and P fertilizer helped to increase the leaf Anthraquinon content in leaf. In comparison of the sole application of N, Anthraquinon content was greater in the plants supplied with both N and P fertilizers. Aloin contents in leaves were increased by 5% to 132% at the different combinations of N and P fertilizers. The greatest aloin content occurred at N; and was significantly greater than that of No, N; and N4, irrespective of the application amount of phosphorus. Increasing of application was propitious for improving Aaloin content in leaf at low supply rate of N.