INTERACTION EFFECTS BETWEEN NITROGEN LEVELS AND BIOFERTILIZER INOCULATION METHODS ON OKRA GROWTH, YIELD AND PODS QUALITY.

Two field trials were conducted at Sakha Horticultural Research Station Farm during the successive summer seasons of 2012 and 2013. The aim of the present study was to evaluate the effect of three nitrogen fertilization levels (60, 30 and 15 Kg N fed -1 ) and two biofertilizer inoculation methods (liquid and tablets) on okra (Eskandrani var.) growth, yield and pods quality. 60 kg N fed -1 and liquid biofertilization method had the highest values of number of leaves / plant (36.19 and 37.52), stem length (96.84 and 110.14 cm), leaf area (409.93 and 425.8 cm 2 ), leaf dry weight (21.09 and 21.2 %), number of pods plant -1 (69.41 and 77.38), early yield (2.24 and 2.66 ton fed -1 ) total yield (6.156 and 6.536 ton fed -1 ) and nitrate concentration in okra dry pods (102.4 and 123.2 mg kg -1 ). The interaction between application of 25% of the recommended nitrogen and tablets biofertilizer inoculation method had the lowest values of the previous parameters. Increasing nitrogen fertilization levels led to increase P% in okra leaves and pods either with or without biofertilization. Increasing nitrogen levels plus biofertilizer led to increase No3 in leaves and pods.

[1]  A. Rizvi,et al.  Role of plant growth promoting rhizobacteria in sustainable production of vegetables: Current perspective , 2015 .

[2]  E. Moyin-Jesu.  Use of plant residues for improving soil fertility, pod nutrients, root growth and pod weight of okra (Abelmoschus esculentum L). , 2007, Bioresource technology.

[3]  R. Knany,et al.  IMPACT OF MINERAL AND BIO-NITROGEN FERTILIZATION ON NITRATE ACCUMULATION OF CUCUMBER , 2006, Journal of Soil Sciences and Agricultural Engineering.

[4]  P. Santamaria.  Nitrate in vegetables: toxicity, content, intake and EC regulation , 2006 .

[5]  A. Pinchera,et al.  Relative potencies and additivity of perchlorate, thiocyanate, nitrate, and iodide on the inhibition of radioactive iodide uptake by the human sodium iodide symporter. , 2004, Thyroid : official journal of the American Thyroid Association.

[6]  J. Adediran,et al.  Soil Amendments Affect the Release of P from Rock Phosphate and the Development and Yield of Okra , 2004 .

[7]  V. Smil.  PHOSPHORUS IN THE ENVIRONMENT: Natural Flows and Human Interferences , 2000 .

[8]  J. Singh.  A rapid method for determination of nitrate in soil and plant extracts , 1988, Plant and Soil.

[9]  K. A. Gomez,et al.  Statistical Procedures for Agricultural Research. , 1984 .

[10]  Bannikova La.  COLORIMETRIC METHOD OF TOTAL ANALYSIS OF ALKYLAMINES , 1963 .

[11]  Anil . Kumar,et al.  Influence of integrated nutrient management on growth and seed yield of okra (Abelmoschus esculentus (L.) Monech) cv VRO-6. , 2015 .

[12]  S. Wright,et al.  GROWTH, YIELD AND NITRATE ACCUMULATION OF IRRIGATED CARROT AND OKRA IN RESPONSE TO NITROGEN FERTILIZATION , 2010 .