Antioxidant Content and Yield of Cabbage as Influenced by Organics and Inorganics on an Alfisol
Loading...
Files
Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
A field investigation entitled “Antioxidant Content and Yield of Cabbage as
Influenced by Organics and Inorganics on an Alfisol” was conducted at College Farm
and laboratory analysis of the samples obtained from the field at the Department of Soil
Science and Agricultural Chemistry, College of Agriculture, Professor Jayashankar
Telangana State Agricultural University, Rajendranagar, Hyderabad during the year 2014-
15. The objectives of the experiment are to study the effect of inorganics and organics on
the antioxidant content, drymatter and head yields, nutrients content and uptake of cabbage,
microbial populations of the rhizosphere and soil fertility status.
The experiment was carried out with seven treatments in a Randomized Block
Design comprising of three factors replicated thrice having cabbage as the test crop. The
treatments are two levels of fertilizers (100% and 75% RDF), two levels of humic acid (0
and 30 kg ha-1) and three organic sprays viz., salicylic acid, ascorbic acid and humic acid of
them the first two are antioxidants.
Humic acid when applied at 30 kg ha-1, showed a significant increase in the
drymatter to 2.4 t ha-1 against 1.93 t ha-1 without humic acid. Reduced level of fertilizers
when applied in conjunction with humic acid resulted in comparable nutrient contents of
the plant. Soil application of humic acid coupled with foliar applied humic acid fared well
in increasing nutrient contents in plant. Application of humic acid and foliar spray of
organics also significantly improved the nutrient content and uptake by plant. The available N, P2O5 and K2O of soil were 292, 69.5 and 297 kg ha-1 with 100%
RDF and 285, 54.8 and 291 kg ha-1 with humic acid. Available P present in the soil at 45
DAP when humic acid was applied in integration was significantly higher with reduced level
of 75% RDF i.e., 81.0 kg ha-1 against 64.4 kg ha-1 with 100% RDF alone.
Humic acid when applied at 30 kg ha-1showed significant effect on bacterial and
fungal population of 59 x 105 CFU g-1 soil and 22x 104 CFU g-1 soil respectively. Salicylic
acid encouraged the formation of fungal colonies while ascorbic acid bacterial colonies.
Drymatter yield was not influenced by levels of fertilizers. Humic acid when
applied at 30 kg ha-1, showed a significant mean drymatter of 2.4 t ha-1. Application of
100% RDF resulted in a significantly higher yield of 32.8 t ha-1, which was 16 per cent
higher than the yield of 28.4 t ha-1 obtained due to 75% RDF. The yield, nutrient contents
and uptakes realized by 100% RDF can be almost achieved at a reduced level (75%) of
fertilizers by integrating with soil application of humic acid @ 30 kg ha-1 and foliar
application of organics. Individual application of inorganic fertilizers at 75% RDF across humic acid and
organic sprays contained a higher mean TFC of 12.30 μg rutin g-1 fw. Humic acid also
showed significantly higher mean TFC of 12.82 μg rutin g-1 fw., mean TPC of 30.33 μg of
pyrocatechol g-1 fw. Foliar application of humic acid was found to increase mean TPC to
30.72 μg of pyrocatechol g-1 fw. Salicylic showed higher mean TAC of 9.86 μg AAE mg-1.
The DPPH (%), the radical scavenging capacity, was significantly higher for 75% RDF i.e.,
66.2. Among the three organic sprays, salicylic was significant and showed a DPPH of 67
per cent and reducing power of 0.71 while it was on par with humic acid.
From the above investigations, it was understood that at higher dose of fertilisers
(100% RDF), the antioxidant contents (TPC, TFC) and antioxidant capacity, radical
scavenging power and reducing power were much lower as compared to the reduced level
of fertilisers. While, in respect of drymatter yield there was no significant difference
amongst the levels of fertilisers. The nutrient contents and uptakes realized by 100% RDF
can be almost achieved at a reduced level (75%) of fertilisers by integrating with soil
application of humic acid @ 30 kg ha-1 and foliar application of organics.
Description
Keywords
acidity, organic acids, fertilizers, planting, cabbages, antioxidants, yields, vitamins, organic acid salts, nutrients