ISHS Acta Horticulturae 820: VIII International Mango Symposium
EFFECT OF ORGANIC AND INORGANIC NUTRIENTS ON IMPROVING FLOWERING |
| Authors: | A. Das, K.K. Mandal, M.A. Hasan, B. Bhattacharya, D. Majumder, B. Bandopadhyay |
| Keywords: | mango, himsagar, Azospirillum, VAM, phenol, carbohydrate, starch, total sugar, reducing sugar, non-reducing sugar, inoculation, nitrogen, phosphate, potassium microbial propagules, flowering, leaf, shoot |
| Abstract:
An experiment with different organic and inorganic nutrients was conducted at the Bidhan Chandra Krishi Viswavidyalaya during the year 2000 to 2004. The experiment was laid out in randomized block design with three replications. The results of application of different organic and inorganic nutrients viz. (i) 50% of the recommended dose of NPK (T1), (ii) 100% of the recommended dose of NPK (T2), (iii) 50% of the recommended dose of NPK + Azospirillum inoculation (T3), (iv) 50% of the recommended dose of NPK + VAM inoculation (T4), (v) 50% of the recommended dose of NPK + Azospirillum + VAM inoculation (T5), (vi) 100% of the recommended dose of NPK + Azospirillum inoculation (T6), (vii) 100% of the recommended dose of NPK + VAM inoculation (T7), (viii) 100% of the recommended dose of NPK + Azospirillum + VAM inoculation (T8), (ix) control (T9) on flowering behaviour of mango cv. Himsagar. The experiment was carried out on 25 years old trees. The highest shoot growth was recorded in the plants receiving 100% recommended doses of fertilizers along with Azospirillum and VAM inoculation whereas maximum flowering (63.60%) and fruiting (71.33%) was observed in the plants supplied with 50% recommended of nutrients combine with Azospirillum and VAM inoculation. The nitrogen, phosphorus and potassium content was maximal in leaf and shoot in the plants receiving 100% of recommended dose of nutrients along with combined inoculation (T8). However, the phenol content was maximum in the plants treated with 50% of the recommended dose of nutrients along with combined inoculation (T5) in both leaf and shoot irrespective of the month of observation (i.e. in shoot 3.12 and 1.82% and 2.39 and 1.56% in October and February, respectively) and shoot in the plants treated with 50% of recommended dose of NPK along with both the combined inoculation of VAM and Azospirillum. Starch, total and reducing sugar content showed the highest value in the plants receiving 50% of recommended dose of NPK along with the inoculation of VAM and Azospirillum. However, non-reducing sugar content of leaf was recorded maximum in the treatment (T5) in October and the treatment (T8) in February. But the trend was reverse with respect to non-reducing sugar content in shoot. Carbohydrate/nitrogen (C/N) ratio was recorded maximum in leaf (6.34 and 10.71 in October and February respectively) in the plants receiving 50% of recommended of NPK + Azospirillum + VAM inoculation. In contrast C/N ratio in shoot was found maximum (9.52) in the plants supplied with 50% recommended dose of NPK + VAM inoculation in October and February (16.85) in the plants supplied with 50% recommended dose of fertilizers along with combined inoculation. The number of microbial propagules observed was highest (3.7 x 103 per gram of soil) in the month of June in the plants treated with 50% recommended NPK + Azospirillum (T3) but in October plants supplied with 50% recommended dose of NPK + Azospirillum inoculation + VAM (T5) showed the highest count (4.4 x 103 per gram of soil). The results indicate that application of Azospirillum and VAM along with 50% recommended dose of fertilizers significantly influence the physiological and biochemical behavior in relation to flowering in mango cv. Himsagar. It is suggested that higher intensity of nitrogen fixing microbial colony improved the nutritional status of plants, which enhance the growth response, flowering and related biochemical parameters. | |
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