EFFECT OF FOLIAR SPRAY WITH HUMIC ACID AND GREEN MICROALGAE EXTRACT ON GROWTH AND PRODUCTIVITY  OF GARLIC PLANT GROWN IN SANDY SOIL

A field experiment was undertaken during kharif 2012 to study effect of biofertilizers and foliar application of organic acids on yield, nutrient uptake and microbial activity of soybean at MARS, Dharwad under rainfed condition. The experiment was laid out in RCBD factorial having twenty treatment combinations and replicated thrice. The treatments comprised of four P-Solubilizers (PSB, VAM, PSB + VAM and Control) and five foliar spray of organic acids (Humic acid, Lecithin, Citric acid, Maleic acid and control). The results revealed that higher seed yield of soybean (35.96 q ha-1) was obtained with the treatment combination of dual inoculation of PSB+VAM with foliar spray of 0.1% humic acid at flower initiation and was higher to an extent 22.5 per cent compared to control (27.90 q ha-1). Similar trend was observed on microbial activity and nutrient uptake (N, P2O5 and K2O) of the soybean crop.

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Azolla as an Alternative of Mineral Nitrogen for Chamomile Plant (Matricaria chamomilla L.) Fertilization in Sandy Soil

Asian Journal of Soil Science and Plant Nutrition ◽

10.9734/ajsspn/2019/v5i430074 ◽

2020 ◽

pp. 1-13

Author(s):

Kawthar, A. E. Rabie ◽

M. H. El-Sherif ◽

R. M. El-Shahat ◽

Fatma, S. I. Ali

Keyword(s):

Antioxidant Activity ◽

Sandy Soil ◽

Growth Parameters ◽

Chemical Constituents ◽

Foliar Spray ◽

Maximum Growth ◽

Volatile Oil ◽

Mineral Nitrogen ◽

Total Phenolic ◽

Nitrate And Nitrite

Two pot experiments were carried out during the two successive seasons of 2010/2011 and 2011/ 2012 to apply mineral nitrogen and/or Azolla at different methods of addition with a reduction of mineral nitrogen fertilizer and its effect on vegetative growth, the yield of inflorescences, total phenolic concentration, antioxidant activity, nitrate and nitrite concentrations and the volatile oil concentrations and composition of chamomile inflorescences in sandy soil. Data indicated that dry Azolla (DA) treatments increased significantly plant height, number of branches/plant, shoot fresh and dry weights and number of inflorescences/plant against the rest treatments. It is clear that DA singly induced maximum growth parameters in both seasons and the reverse was true with fresh Azolla (FA) alone. It is obvious that DA achieved the highest total phenolic concentrations, antioxidant activity and volatile oil (VO) concentrations, and the opposite response was true for nitrate & nitrite concentrations. Addition of 50% ammonium nitrate to 50% FA or 50% Azolla extract as foliar (spray Azolla) SA have positive effect on chemical constituents except nitrate and nitrite concentrations. It is evident that the highest chamazulene and α ̶ bisabolol oxide ̶ B were achieved with DA and the reverse was true for α ̶ bisabolol oxide ̶ A. Dry Azolla treatment alone was the most efficient one in increasing the yield production with increment in active substances of chamomile plant in sandy soil.

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