Objective The effects of nitrogen(N), phosphorus(P), potassium(K), magnesium(Mg) and boron(B) on dry matter accumulation and nutrient absorption and utilization of seed lotus(Nelumbo nucifera)were studied to provide theoretical basis for scientific fertilization.

Method Using‘Taikonglian No.36’as a test material, the whole growth period micro-plot (2.25 m²) experiment was carried out in Guangchang County, Jiangxi Province. Lotus seeds together with the receptacle were harvested in time, and the rest of the whole plant was collected after harvest. The dry matter accumulation of each organ (part) and the nutrient contents of N, P, K, Mg and B were measured, and the total amount of nutrient absorption and its distribution in different organs (parts) were calculated.

Result In low Mg and B soil, the combined application of N, P, K, Mg and B significantly increased the dry matter accumulation of seed lotus, and the effect on the dry matter accumulation of seed lotus were N > Mg > K > B > P. Compared with the combined application of N, P, K, Mg and B fertilizers, without the application of N, P, K or B, the content of this nutrient in the organs (parts) of seed lotus would be reduced in various degrees, in which the content of N in reproductive organs such as flower stalk, lotus canopy louts seed lotus shell, the content of K in storage organs or supporting parts such as developed rhizome, rhizome, flower stalk and receptacle, and the content of Bin most organs (parts) such as leaves, developed rhizome and reproductive organs all decreased significantly. The N content of the whole plant without N application treatment, and the B content of the whole plant without B application treatment also decreased significantly, but the Mg content in different organs (parts) of seed lotus had no significant response to no Mg fertilization. The combined application of N, P, K, Mg and B significantly increased the total nutrient accumulation of seed lotus, and the effects on N, P and Mg accumulation of seed lotus plants were N > Mg > B > K > P. The effect on K accumulation was N > Mg > K > B > P, the effect on B accumulation was N > B > Mg > K > P, no K treatment significantly reduced the distribution of K in petiole, no B treatment significantly reduced the distribution of B in leaves.

Conclusion We should not pay attention to the reasonable application of N, P and K, but also pay attention to the supplement of Mg, B and other trace elements in Guangchang and similar areas of low Mg and low B lotus field soil, in order to increase the yield and quality potential of lotus seed.