Effects of planting density and pre-basic seed size on seed potato produc-tion

WANG Haiyan; WANG Lichun; TIAN Guokui; LI Fengyun; PAN Yang; PANG Ze; HAO Zhiyong

doi:10.16861/j.cnki.zggc.2025.0137

Abstract：In order to investigate the effects of different planting densities of potato test tube seedlings on the quantity and yield of pre-basic seeds,as well as the effects of different tuber sizes of pre-basic seeds on germination quality,original seeds quantity and yield.This experiment used Kexin 23 test tube seedlings as the experimental material,with different planting densities of 6,12,18,24,30,and 36 seedlings per box.After harvest,the number and mass of tubers at different grades in each treatment were counted and measured respectively.The graded pre-basic seeds were divided into five treat-ments,namely T1(single potato mass<2 g),T2(2 g≤single potato mass<5 g),T3(5 g≤single potato mass<10 g),T4(10 g≤single potato mass<20 g),T5(single potato mass≥20 g).After the tubers were released from dormancy,chang-es in the number,length,and diameter of buds were recorded.The five processed pre-basic seed tubers were continued to be planted,graded after harvest,and the quantity and mass of potato tubers were counted.The research results indicated that the total potato mass increased first and then decreased with the increase of test tube seedling planting density.When the planting density was 24 plants per box,the number of potato produced was the highest and the total mass of potato was the maximum.The number of tuber per plant,the effective number of tuber per plant,and the corresponding mass all decrease with increasing planting density.The number,length,and diameter of buds of the pre-basic seed with single tuber mass of≥20 g were larger than those of other tubers.The larger the pre-basic seed tuber,the greater the total tuber mass and effective tuber mass.In summary,when the planting density of test tube seedlings was 24 plants per box,the total number of tuber and total tuber mass of the pre-basic seeds were the highest,and the number and mass ratio of effective tuber were also the highest,at 94.35%and 99.78%,respectively.The pre-basic seed with single potato mass of≥20 g had a higher number of bud,longer and thicker bud.When sowing whole potato using the pre-basic seeds with single potato mass of≥20 g,the total number and total potato mass of the harvested original seeds were the highest.The number and mass ratio of original seeds with single potato mass≥20 g were the highest,accounting for 32.93%and 67.86%,respectively,and the least num-ber of ineffective potato were produced.