Effect of humic substances addition and foliar spraying with biostimulants on growth, Yield and Quality of potato (solanum tuberosum)‎

الملخص EN

Two field experiments were conducted at private farm in Ismailia Governorate during two winter seasons of 2017 and 2018 to study the response of potato tuber (Solanum tuberosum L.

cv Spunta) to application of humic substances from different sources i.e, potassium humate (solid HKS and liquid HKL) and humic acid (HA) and foliar spray with bio-stimulants of., dry yeast, compost tea and seaweed extract.

HA combined compost tea in increased plant height with highest value of 60.3 cm plant-1.

Humic substances and biostimulants increased, total chlorophyll, vitamin C, starch and protein with highest value due to HA with combined foliar spray with seaweed extract.

Contents of N, P and K their uptake increased due to HA with or without biostimulants with highest values due to HA with foliar sea weed extract spray.

Humic substances and biostimulants increased soil available N, P and K after potato harvest.

Soil treated with HKS + seaweed extract gave the highest of available N and P while, HKS + Compost Tea gave the available N.