【摘要】 为了探究外施硅肥对于紫花苜蓿生长的影响和确定最佳硅肥施量,采用大田试验,利用滴灌水硅一体施肥技术,设置了0g/m2(CK)、15g/m2(S1)、60g/m2(S2)、105g/m2(S3)、150g/m2(S4)5个硅肥外施量对紫花苜蓿的生长进行了研究。结果表明,外施硅肥能够促进紫花苜蓿植株生长。施用硅肥处理(S1,S2,S3,S4)相比于CK,第一茬叶面积增大68.0%~117.2%,第二茬增大37.9%~133.7%;第一茬鲜干比增大9.5%~37.7%,第二茬增大15.7%~33.3%;第一茬植株生长前期株高增长量增加50.0%~163.2%,第二茬增加22.0%~46.5%;第一茬生长中期株高增长量增加27.2%~69.7%,第二茬增加10.5%~44.4%;第一茬节间距增加14.9%~32.5%,第二茬增加13.6%~39.3%;第一茬节间数增加15.8%~32.2%,第二茬增加25.0%~65.0%;第一茬干草叶质量提升49.8%~80.6%,第二茬提升了13.6%~39.3%;第一茬干草产量增加了53.5%~96.9%,第二茬增加18.2%~46.4%。硅肥施量105g/m2对苜蓿生长的促进能力高于其他施硅处理。更多还原

【Abstract】 In order to explore the influence of silicon fertilizer on the growth of alfalfa and to determine the optimum concentration of silicon fertilizer,a field experiment was carried out with five treatments of silicon fertilizers concentrations such as 0g/m2(CK),15g/m2(S1),60g/m2(S2),105g/m2(S3),150g/m2(S4).The results showed that silicon fertilizer was positive to promote alfalfa growth.Compared S1,S2,S3 and S4treatments with CK,the leaf areas increased by 68.0%~117.2% and 37.9%~133.7%for the first and second cuts respectively;the ratio of green to hay increased by 9.5%~37.7%and 15.7%~33.3%for the first and second cuts respectively;the increments of early growth stage heights increased be 50.0%~163.2% and 22.0%~46.5%for the first and second cuts respectively;the increments of middle growth stage heights increased by 27.2%~69.7% and 10.5%~44.4%for the first and second cuts respectively;the intermodal distance increased by 14.9%~32.5% and 13.6%~39.3%for the first and second cuts respectively;the number of internodes increased by 15.8%~32.2% and 25.0%~65.0% for the first and second cuts respectively;yield increased by 53.5%~96.9% and 18.2%~46.4%for the first and second cuts respectively;dry leaf weights increased by 49.8%~80.6%and 13.6%~39.3%for the first and second cuts respectively.S3 treatment promoted alfalfa growth at the most extent compared to S1,S2 and S4treatments,and 105g/m2 was the optimum concentration of silicon fertilization for alfalfa growth.更多还原