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闽清县耕地土壤有78.3%属缺镁水平。为探索施镁肥对农作物增产效果,以农用氢氧化镁为供试肥料,选用本地区种植面积较大、对镁元素敏感的白菜、晚稻两作物进行田间试验,分别按镁肥用量不同设5个水平,氢氧化镁肥全部采用全层基施。结果表明,施用镁肥均不同程度提高了水稻分蘖期与齐穗期叶绿素含量。适宜用量范围内,施用氢氧化镁均提高了白菜、晚稻产量,其中白菜、晚稻分别以氢氧化镁用量225、120 kg/hm2增产效果最佳,分别增幅12.7%与9.1%,经济效益分别增效12423.9、1410元/hm2。但晚稻用量超过120 kg/hm2,产量显著下降。在最高产量下的施镁肥水平,与CK相比,种植白菜与晚稻田块土壤有效镁分别增加14.3与11.3 mg/kg。在土壤有效镁基本相当条件下,晚稻对镁肥较白菜表现敏感,过多反而减产。总之,闽清县在白菜与晚稻上施用氢氧化镁,既增产增收又能提高土壤有效镁的含量,促进耕地养分平衡,但需掌握合理用量。
There are 78.3% of the cultivated land in Minqing County, which belongs to the magnesium deficiency level. In order to explore the application effect of magnesium fertilizer on crop yield increase, taking magnesium hydroxide as tested fertilizer, field test was conducted on two crops of cabbage and late rice sensitive to magnesium element, which were planted in this area. A level, all the magnesium hydroxide fertilizer using full-base facilities. The results showed that the application of magnesium fertilizer increased the chlorophyll content at the tillering and heading stages of rice to varying degrees. In the range of appropriate dosage, the application of magnesium hydroxide increased the cabbage yield and late rice yield respectively. Among them, cabbage and late rice had the best yield increase with the dosage of magnesium hydroxide 225 and 120 kg / hm2 respectively, increasing by 12.7% and 9.1% respectively, Effective 12423.9,1410 yuan / hm2. However, the amount of late rice more than 120 kg / hm2, the output decreased significantly. Compared with CK, the levels of magnesium in soil at the highest yield were increased by 14.3 and 11.3 mg / kg, respectively. In the soil equivalent to the basic conditions of magnesium, late rice magnesium fertilizer more sensitive to cabbage, too much but instead cut. In short, the use of magnesium hydroxide in cabbage and late rice in Minqing County not only increases production and income, but also increases the content of available magnesium in the soil and promotes the balance of arable land. However, it is necessary to know the reasonable dosage.