不同有机肥施用量对空心菜的产量及品质的影响

Impact on Output and Quality of the Water Spinach of Different Amount Organic Fertilizer Application

通过无公害栽培技术中不同施肥量对空心菜的产量及品质的影响进行研究,得出结论:在实验条件下,施用中量有机肥(15000kg/hm2)对空心菜的长势,前期生长、及产量增产作用最大,增长最显著。而过量施用有机肥(22500kg/hm2)、施用有机肥低(7500kg/hm2)增产作用不明显。从一个生长期来看,不同施肥量引起硝态氮含量变化无明显规律性,从整个生长周期来看,硝态氮在植株中的含量呈一个由少到多,之后又变少的过程,但都低于国家标准(小于等于3000mg/kg,GB/T5009.33-1996)。在此次试验施肥量范围内Vc含量变化不明显。

The effects of different amount of organic fertilizer application in the nuisance-free cultivation technique on quantity and quality of water spinach were studied in the paper. The results showed that under the condition of this experiment, there was an obvious increase on growing situation, earlier growing stage and output when medium organic fertilizer （15000kg/hm^2） was applied on the water spinach. But it won＇t increase much if excessive organic fertilizer （225000kg/hm^2） or insufficiently （7500kg/hm^2） is applied. In one growing period, the change of nitrate content had obscure regularity when the different quantity of fertilizer was applied. In the whole growing cycle, the nitrate content in the plant changed from little to more and then to little. But it was lower than the national standard all the while. As to the content of Vc, the change was not obvious.