Yield compensation in gappy potato crops and methods to measure effects of fungi pathogenic on seed tubers

摘要: SUMMARY Pathogens damage potatoes in so many ways and at stages of cropping, transport storage that it is difficult to estimate their total effect. This paper describes methods used measure how fungal pathogens affected crop health yield, experiments measured much the yield lost through gaps was compensated by extra growth neighbouring plants. Some tubers stocks were diseased, healthy controls not available contrasts could be made only selecting grades differing symptom severity. The differences represented part because infections are symptomless, vigorous plants compensate for small yields weak or absent neighbours. Plots gapped randomly varying degrees emergence flowering showed decreased 0–332 (± 0–129) %and“833 0–094) % respectively, every 1 removed. When up 24 removed regression percentage on did become significantly non-linear.