MANAGEMENT OF LEAF REDDENING IN Bt COTTON THROUGH FOLIAR NUTRITION
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104
Abstract
The field experiment was conducted at the Main Agricultural Research Station,
Raichur, Karnataka during the kharif 2018-19 with eight treatments replicated thrice in a
completely randomized block design to assess the effect of conventional and
multi-nutrient fertilizers on management of leaf reddening in Bt cotton. The results
revealed that incidence of leaf reddening in Bt cotton was decreased significantly on
application of RDF along with foliar spray of MgSO4 (1%) + 19:19:19 (1%) at flowering,
boll initiation and boll development stages. Similarly, the extent of management of leaf
reddening incidence was on par with the application of RDF along with foliar spray of
laboratory prepared multi-nutrient Bio-mix solution @ 10 ml litre-1 at flowering, boll
initiation and boll development stages. Therefore, the above treatments respectively
recorded significantly higher seed cotton yields (3226 kg ha-1 & 3005 kg ha-1) over the
other treatments. The quality parameters of cotton were also of high grade in these
treatments. The foliar nutrition of Bt cotton helped in better management of leaf
reddening as well as in meeting the nutritional demand of the crop at different
physiological growth stages and thus a higher gross returns (Rs 1,74,222 ha-1), net
returns (Rs 1,12,579 ha-1) and B:C (2.83) was achieved with treatment: RDF along with
foliar spray of MgSO4 (1%) + 19:19:19 (1%) at flowering, boll initiation and boll
development stage which was on par with the treatment: RDF along with foliar spray of
Bio-mix @ 10 ml litre-1 at flowering, boll initiation and boll development stages. Finally,
it can be concluded that leaf reddening in Bt cotton can be effectively managed and one
can fetch higher returns through inclusion of foliar nutrition as a standard practice of
crop nutrition in Bt cotton along with standard pest management and agronomic
practices.
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