旱作马铃薯钾素的吸收、积累和分配规律

马铃薯各器官钾素浓度随生长发育进程均呈现递减变化,且地上茎中钾素浓度始终高于叶片和块茎,而块茎和叶片的钾素浓度差异较小。钾素(K2O)的吸收速率呈单峰曲线变化,在种植密度适宜、氮磷钾适量配施下,最高吸收速率可达130 81mg/(株·d),峰值出现在出苗后47d左右;钾素(K2O)积累量随生长发育进程呈三次曲线变化,在优化栽培条件下,每生产500kg块茎需吸收钾素(K2O)4 49kg;成熟期钾素在叶片、地上茎、块茎中的分配率分别为10%～20%、10%～20%、60%～70%。

POTASSIUM ABSORPTION,ACCUMULATION AND DISTRIBUTION OF POTATO UNDER DRY FARMING

Change of K content in organs of potato gradually reduced alone with growth process.K content in above ground stems was higher than in leaves and tubers during growing stage,and the difference between tubers and leaves was not significant. Change of K (K_2O) absorption velocity of potato was a single-peak curve during all stages,and its peak emerged at about 47 days after emergence,the maximal absorption velocity almost being 130.81 mg/plant·d under reasoning density,and N,P,and K applications. Change of K (K_2O) accumulation was a cubic curve,and 4.49 kg K (K_2O) was required when 500 kg potatoes were produced under optimum cultivation. K distribution in leaves,above ground stems and tubers in maturing stage was 10%～20%,10%～20%,and 60%～70%,respectively.