论文部分内容阅读
泥炭、岩棉作为无土栽培基质需要频繁更换,不适合运输成本较高的南海诸岛,海砂可就地取材,是南海诸岛首选无土栽培基质。我国尚没有利用海砂作为无土栽培基质的研究,为明确其可行性,以3∶1椰糠蛭石混合基质(CK)为对照,以淡化海砂(T)为处理,进行生菜栽培对比试验,分析形态指标、产量、营养品质和食品安全指标。结果显示:砂栽培生菜商品产量和总干重分别比对照高14.93%和49.73%;砂栽培生菜可溶性糖含量(2.47%)比对照(0.37%)高,硝态氮含量(1.77 mg/g)比对照(12.67 mg/g)低,差异极显著(P<0.01),砂栽培生菜蛋白质含量和Vc含量与对照差异不显著;砂栽培生菜Ca、Fe、Mg、Zn含量与对照差异不显著,砂栽培生菜与对照As、Cd含量都符合国家标准。研究表明淡化海砂栽培生菜产量正常,营养品质好,食品安全,在南海诸岛利用淡化海砂作为无土栽培基质进行蔬菜生产是可行的。
Peat, rock wool as soilless culture substrate need frequent replacement, not suitable for transportation costs higher South China Sea islands, sea sand can be drawn on the spot, is the preferred South China Sea islands soilless culture substrate. In order to clarify the feasibility of using sea sand as a substrate for soilless culture, the comparison of 3: 1 cocoa vermiculite mixed substrate (CK) and desalination of sea sand (T) Test, analysis of morphological indicators, yield, nutritional quality and food safety indicators. The results showed that the yield and total dry weight of sand culture lettuce were 14.93% and 49.73% higher than that of the control respectively; soluble sugar content of lettuce (2.47%) in sand culture was higher than that of the control (0.37%), nitrate content (1.77 mg / g) Compared with the control (12.67 mg / g), the difference was significant (P <0.01). The contents of protein and Vc in sand-cultivated lettuce were not significantly different from those in the control. The contents of Ca, Fe, Mg and Zn in sand- Sand culture lettuce and control As, Cd content are in line with national standards. Studies have shown that desalination of sea sand cultivation of normal production of lettuce, good nutritional quality, food safety, in the South China Sea islands using desalinated sea sand as soilless culture substrate for vegetable production is feasible.