苎麻苗期封行期植株营养诊断及调节施肥研究

以“养分指数”为依据对新栽麻和成龄麻苗期、封行期进行植株养分平衡营养诊断,结果表明,各时期养分元素障碍因子对产量与品质的限制程度依次为(1)苗期新栽麻B>Fe>Cu>S,成龄麻N>B>P>Fe>Cu>S;(2)封行期基础肥力较好的土壤上新栽麻Mg,B>Zn>K>Ca,成龄麻Mg,B>Zn>N,P>K>Ca;基础肥力较差的土壤上新栽麻与成龄麻Mg,B>Zn>N,P>K>Ca>

NUTRIEIONAL DIAGNOSIS AND REGULATED FERTILIZATION FOR RAMIE PLANTS IN SEEDLING AND CROP CLOSURE STAGES

Diagnosis of the status of nutrient balance in the newly planted and ripe ramie ( Boehmeria nivea ) plants at their seedling and crop closure stages showed that the nutrition disorder factors limiting the yield and quality were in the order of B>Fe>Cu>S for newly planted ramie and N>B>P>Fe>Cu>S for ripe ramie plants at the seedling stage; while at the crop closure stage, the limiting factors appeared in the order of Mg/B>Zn>K>Ca for newly planted ramie on fertile soil, Mg/B>Zn>N/P>K>Ca for ripe plants on fertile soil; and Mg/B>Zn>N/P>K>Ca>Fe for both newly planted and ripe ramie plants on poor soil. An optimized balanced fertilization plan was recommended, the implementation of which resulted in a 9.51% improvement in yield and a 7.86 improvement in fiber quality for newly planted ramie. The corresponding improvement for ripe ramie plants was 21.5% and 20.6%.