Impact of biophysical factors as influenced by organic sources of nutrients on major pests of rice
2009
Chandramani, P. | Rajendran, R. | Sivasubramanian, P. | Muthiah, C
Biophysical factors such as epicuticular wax,trichome density and leaf sheath thickness were analysed in the leaf sheath and laminae of plants treated with organic sources of nutrients. The results revealed that wax content and trichome density increased in plants as the age of the plant advanced. The difference in epicuticular wax content was significant among treatments. At 45 DAT, the treatments viz., FYM, biofertilizers, lignite fly ash and neem cake as basal and in splits and FYM plus neem cake as basal and in splits recorded maximum trichome density of 49.33, 49.67, 49.67 and 48.34 / cm2 leaf respectively. The same trend was also noticed on 60 DAT. On 60 DAT, the combination of FYM, biofertilizers and neem cake as basal was significantly superior in having maximum wax content (23.67 mg/g) which was on par with the combination of FYM, biofertilizers, lignite fly ash and neem cake as basal (22.00 mg / g). Treatments showed significant difference in leaf sheath thickness on 60 DAT. But the difference was not significant on 30 DAT and it varied from 0.24 to 0.35 mg/mm2 and the leaf sheath thickness was maximum in the combination of FYM, biofertilizers, lignite fly ash and neem cake in splits which recorded 0.58 mg/ mm2.
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