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Agronomic investigations for yield maximization in chilli through management of leaf curl (MURDA) complex

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Title Agronomic investigations for yield maximization in chilli through management of leaf curl (MURDA) complex
 
Creator M.Shivaprasad
 
Contributor B.M.Chittapur
 
Subject Agronomy
 
Description Field experiments were conducted at Agricultural Research Station, Devihosur,
Haveri, during the growing seasons of 2005 and 2006 to study the effect of barrier cropping
(3, 6 and 9 rows of barrier with fodder/grain sorghum/maize), crop nutrition in chilli based
intercropping system (chilli+ garlic, chilli + coriander and sole chilli with N substitution and
graded level of K) and use of biorationals in quality chilli production and management of leaf
curl (murda) complex.
The experiments on barrier cropping revealed significantly higher dry pod yield of
chilli with nine rows of sorghum (both fodder and grain) barrier (1311 and 1222 kg ha-1,
respectively). The yields with six rows of grain/fodder sorghum were on par. The growth and
yield attributes, quality, oleoresin yield and economic returns were also improved under
barrier cropping compared to no barrier. Besides, lower leaf curl index (LCI) as a
consequence of lower thrips and mites population and increased predator population was
observed in the chilli crop under fodder and grain sorghum barriers compared to chilli crop
without barrier. Impacts were more conspicuous on the lee ward side of the barrier than on
the wind ward side.
Similarly, polycropping involving garlic as intercrop and 50 per cent substitution of
recommended nitrogen through poultry manure increased good quality fruit yield with
concomitant reduction in thrips and mites population and LCI in comparison to sole chilli
with conventional fertilization. Though entire substitution of nitrogen through poultry manure
and application of double the recommended potassium (100 kg ha-1) had grater suppressing
effect on insect pests and leaf curl complex, the economic returns were significantly higher
with the former treatment combination.
The experiment on the use of biorationals with N substitution revealed that 50 per
cent N substitution equally through vermicompost (2.5 t ha-1) and neem cake (500 kg ha-1)
along with pest control through alternate sprays of Abamectin (3 times) and Perfect (2 times)
biorationals, recorded significantly higher dry fruit yield of chilli (1131 kg ha-1) over
conventional chemical fertilizer and plant protection measures (693 kg ha-1). Similar trends
were observed in economics (Rs.56,530, 34,130 and 2.75 of gross return, net return and B: C
ratio, respectively) and predator population of coccinelloids and spiders. Whereas reverse
trend was visible in thrips and mites population and LCI. Nevertheless, Nimbicidine
alternated with leaf extract, Panchagavya and leaf extract + Panchagavya irrespective of
source of nutrition resulted in comparable effects as that of recommended chemical schedule
(two sprays of Dimethoate (1.7 ml l-1) + 2 sprays of dicofal (2.5 ml l-1) + Carbaryl (4g l-1).
Thus, the study brought out the technologies for yield maximization in Byadgi chilli cultivar
with least chemical spray.
 
Date 2016-07-23T09:05:57Z
2016-07-23T09:05:57Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69450
 
Format application/pdf
 
Publisher UAS Dharwad