تأثير مستوى و طرق إضافة البوتاسيوم مع ماء الري في كمية البوتاسيوم الجاهز عند مراحل نمو محصول الطماطة (Lycopersicon esculentum Mill )‎

الملخص EN

A field experiment was conducted during the growing season of 2013-2014 of tomato grown under plastic house the study effect of Potassium Fertigation on available K in soil.

Potassium (K2SO4)as source of potassium was added at rates of 0,100,200,300,400 and 500 kg ha-¹ at four methods(conventional method, 50% to soil +50% fertigation, equal doses method divided at seven dosed and fertigated to plant with (12) days intervals and according to plant growth stage.

Soil sample (0-30 cm) were collected at five stage of plant growth (50% flowering ,50% fruitage ,50% maturity ,full maturity and at end of season).

available K was determined.

Result showed that applied K as fertigation according to plant growth stage or 50% to soil +50% fertigation resulted in highest available K in soil compared with other application.

Result also that K concentration in soil increased with increasing K rate.

Highest K concentration in soil (317.63gm kg-¹soil)found at growth 50% fruitage at rate of 500kg K ha.