استخدام بعض العوامل الحيوية و كبريتات البوتاسيوم في مقاومة الفطر Rhizoctonia solani المسبب لذبول الكلم (Brassica caulorapa)‎ و تقويم تأثيرها على الإنتاج

الملخص EN

- This study was carried out to evaluate the efficiency of the compost and biological control fungus Trichoderma harzianum, spraying with potasium sulphate, and yeast extract in controlling Kohlrabi (Brassica caulorapa) wilt disease caused by Rhizoctonia solani .

The results of field experiment indicated that interaction treatment (compost + T.

harzianum) had the highest results of parameters of number of leaves, fresh weight of the sixth leaf and the bulb weight giving 17.44 leaf/plant, 31.56 g and 393.21 g, respectively, compared to the lowest average of 8.98 leaf/plant, 19 g and 169.88g resulted from the R.solani treatment, respectively, however the compost treatments showed that spraying in the surface area of the sixth leaf giving 531 cm 2 and 336.1 cm 2 resulted from the R .solani treatment, respectively .

- Spray treatments showed that spraying with potassium sulfate had a positive effect on the surface area of the sixth leaf, and bulb weight resulted in 579.0 cm 2 and 278.48 g, respectively, compared to the treatment of distilled water that resulted in 244 cm 2 and 253.79 g, respectively.

- Interaction treatment gave the highest results for the leaf area which was obtained from the soil treated with T.harzianum interacted with potassium sulfate giving 703.7 cm2 compared to 221.3 cm2 from the pathogenic R.

solani treatment.

While the best result for bulb weight achieved from the treatment of T.harzianum combined with the compost and yeast extract which giving 525.59 g compared to 99.41 g from R.

solani interacted with the yeast extract.