Citation
Rh. Kanth et al., Effect of different sowing dates on heat-unit requirement for different phenophases of brown sarson (Brassica campestris) varieties and dynamics of aphid (Lipaphis erysimi) population, I J AGRON, 45(1), 2000, pp. 170-173
Citations number
5
Categorie Soggetti
Agriculture/Agronomy
Journal title
INDIAN JOURNAL OF AGRONOMY
ISSN journal
0537197X
→ ACNP
Volume
45
Issue
1
Year of publication
2000
Pages
170 - 173
Database
ISI
SICI code
0537-197X(200003)45:1<170:EODSDO>2.0.ZU;2-B
Abstract
A field experiment was conducted during winter season (rabi) 1996-97 and 19
97-98 to study the thermal requirement and dynamics of aphid (Lipashis erys
imi) population (Brassica campestris) for 3 cultivars ('KS 101','KS 102' an
d 'KOS 1') of brown sarson, sown at 3 sowing dates (1 October, 15 October a
nd 1 November). The data revealed that October-sown crop accumulated more t
hermal units and thereby produced significantly higher yield than November
sown crop. Although 'KS 101' (Gulchein) recorded higher seed yield than 'KS
102' and 'KOS 1' in turn all the varieties accumulated similar heart units
for different phenophases. Temperature ranging from 17.5 to 22 degreesC ac
companied by relative humidity varying from 62 to 78% favoured aphid popula
tion but rainfall had the revers effect.