有机肥对油菜硝酸盐含量和土壤盐分累积的影响

探讨了不同C/N的有机肥对油菜生物量、硝酸盐含量以及土壤EC的影响。结果表明:施用低量氮肥,增施M1能够增加油菜的生物量,硝酸盐含量无显著变化;增施M2、M3,能够降低油菜生物量和硝酸盐含量。当N用量为N0.067g kg-1土时(300kg hm-2),增施M1,油菜生物量和硝酸盐含量无显著变化;增施M2、M3时,显著降低生物量和硝酸盐含量。施用高氮肥,增施三种有机肥显著增加油菜生物量,硝酸盐含量无显著变化。三种不同C/N的有机肥在低量氮肥时对土壤EC的影响不显著,在高氮量时,增施M1能够增加土壤EC,增施M2、M3能够降低土壤EC。

Effects of Manure on Nitrate Accumulation in Rape and Salt Accumulation in Soil

The biomass and the nitrate of rape were affected by the doses of N fertilizer and different manure.The results showed that the biomass of rape increased with the application of M_1 together with low dose of nitrogen fertilizer.The nitrate content did not change considerably.The biomass and the nitrate content of rape was decreased by applying M_2 and M_3 with low dose of nitrogen fertilizer.When the dose of nitrogen fertilizer was 0.067N g kg~(1),there was no obvious difference on the biomass and nitrate content by applying M_1,but the biomass of rape and the nitrate content decreased by applying M_2 and M_3.Under higher dose of the nitrogen fertilizer,the biomass of rape increased and the nitrate content did not change significantly by applying M_1,M_2 and M_3.There was no significant effect on soil EC by applying the different manures together with low dose of nitrogen fertilizer.Soil EC increased by applying M_1 together with high dose of nitrogen fertilizer,but Soil EC decreased by applying M_2 and M_3 together with high dose of nitrogen fertilizer.