苦荞干物质及氮、磷、钾养分积累动态分析
Analysis of Dry Matter and NPK Accumulation in Tartary Buckwheat

以西荞1号为材料，研究了高产条件下苦荞干物质积累及氮、磷、钾养分吸收利用规律.结果表明：全生育期苦荞的总干物质积累呈“S”形曲线，根、茎、叶的干物质质量分别在播种后60 d，75 d和45 d达到最大值，干物质量分别为379.7，3 113.7，2 561.2 kg/hm².各器官氮(N)、磷(P)和钾(K)百分比(籽粒除外)随生育时期的推进呈现出先升高后逐渐降低的趋势，幼苗期(播种后15 d)上升较快，后期逐渐下降.籽粒中氮和磷的百分比随生育期的推进呈逐渐上升的趋势，而钾呈逐渐下降的变化趋势.氮、钾总积累量变化规律相似，出苗后持续增加，播种后60 d达最大值，而后略有下降.整个生育期磷素总积累量持续上升，成熟时各器官以籽粒中积累量最高，为10.46 kg/hm².高产条件下，苦荞N，P，K最大需求量分别为152.1，19.6，182.2 kg/hm²，需肥比例分别为1.00:0.13:1.20.
The dynamics of dry matter and NPK accumulation of tartary buckwheat (Fagopyrum tataricum) cv. XiQiao-1 was studied under high-yield cultivation conditions. Total dry matter accumulation presented an S-shaped curve during the whole growth period of the crop, and dry matter content in the roots, stems and leaves was at the maximum at 60, 75 and 40 days after seeding, being 379.7, 3 113.7 and 2 561.2 kg/hm², respectively. The N, P and K content in all organs (except the seed) increased sharply in the seedling stage (15 days after seeding) and then decreased slowly. The N and P content of the seed increased steadily with the advance of growth stage, while the change in K content showed an opposite trend. The total amount of N and K accumulation of tartary buckwheat kept increasing after sowing and reached the maximum at 60 days after seeding, and decreased slightly thereafter. The total amount of P accumulation increased continuously during the whole growth period, and the seed accumulated more P than any of the other organs at maturity, being 10.46 kg/hm². The maximum requirement of N, P and K under high-yield cultivation was 152.1, 19.6 and 182.2 kg/hm², respectively, and the ratio was 1.00:0.13:1.20