Effect of N2-fixing bacteria, different levels from mineral nitrogen and foliar application of potassein on growth and productivity of garlic plants [electronic resource].

Includes references.

Two field experiments were carried out during two successive winter seasons of 2007/2008 and 2008/2009 at the Experimental Farm, El Kassasein Research Station, Ismailia Governorate, to investigate the effect of partially substituting of N fertilizer with N2-fixing Azospirilia and Azotobacter spp. and foliar application of potassein as well as their interaction on growth, dry weight, leaf pigments, yield and chemical constituents of Garlic (Allium sativum L.) cv. Chinese. Fertilization of garlic plants with 100% mineral N (120kg N/fed.) or 75% mineral N plus 1kg Nrfixers recorded the highest values of plant height, number of leaves per plant, both neck and bulb diameter, bulbing ratio, total dry weight per plant, average bulb weight, average clove weight and total yield 1 fed. as well as bulbs content of nitrogen and total protein in garlic bulbs, while, treated garlic plants with biofertilizer only at 8kgl fed. gave the highest values of photosynthetic pigments i.e., chlorophyll a , b and total chlorophyll (a+b) in leaf tissue as compared to other treatments. Spraying garlic plants with potassein at a rate of 6 milL recorded the highest values of both neck and bulb diameters, dry weight of leaves and bulbs, total plant dry weight, average bulb weight, total yield per feddan and relative yield, as well as content of potassium in bulbs. The interaction treatments between 100% mineral N (120kg N/fed.) or 75% mineral N plus 1kg N2,-fixers and foliar application of potassein at a rate of 6ml 1 L gave the maximum vegetative growth parameters, total plant dry weight, yield and its components as well as N, P and total protein in bulbs, meanwhile, the interaction between Nrfixers biofertilizer only at rate 8 kgl fed. and foliar application of 6ml/l potassein recorded the best values of photosynthetic pigments i.e., chlorophyll a , b and total chlorophyll (a+b) in leaf tissue as well as K% content in bulbs as compared to other treatments.

Summary in Arabic.

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