Volume 63, Issue 4
April 1966, pages 165-233
pp 165-170 April 1966
pp 171-174 April 1966
pp 175-217 April 1966
A comparative account of the larval chaetotaxy, pupal structure, venation and genitalia of moths of four species of striped borers belonging to the generaChilotraea andChilo (Lepidoptera: Pyralidae: Crambinae) attacking paddy in Asia is given in detail. The species dealt with areChilotraea auricilia (Ddgn.),C. polychrysa (Meyr.),Chilo suppressalis (Walk.) andC. partellus (Swinh.). Four tabular statements and four keys showing the differences in the chaetotaxy of the borers, pupal structure, wing venation and genital structures are also included to facilitate the accurate determination of these species.
pp 218-222 April 1966
Some of the chelating agents have been shown to be of no avail for studying the trace element requirement of the silkworm.
pp 223-233 April 1966
The results of the nitrogen uptake as influenced by the nitrogen-fixing capacity and organic matter added by blue-green algae during three crop seasons are presented on the basis of field and pot experiments. An estimate of the nitrogen contribution in the study of the residual effect of blue-green algae has also been made.
It is seen that by conditioning the soil (addition of fertilizer mixture) for manifestation of the indigenous flora, Nuptake upto 20 kg.N/ha. (supplied as ammonium sulphate) could be achieved.
The treatment fertiliser mixture +rabbing was also superior to ammonium sulphate at 20 kg.N/ha. The best result was obtained withrabbing + fertiliser mixture + algae. The results obtained from the several treatments indicate that blue-green algae (indigenous flora and/or addition of N-fixing species) could be effectively utilised for rice culture and as a substitute for ammonium sulphate under certain conditions.