S U M M A R YMaize was grown al the Regional Agricultural Research Station, Hathazari, Bangladesh during 1988/89 and 1989/90 to study fodder yield, cob growth and grain yield together with the contribution of pre-silking stem reserves to grain. Population densities were 33300, 44400 and 66600 plants/ha. Plants were either detopped after silking and pollen shedding, keeping 0, 2 or 3 leaves above the cob, or were left entire.The results showed that the maize crop could successfully be detopped for fodder with little or no adverse effect on grain yield. Fodder yield increased with increased plant density and among the detopping treatments the highest fodder yield was obtained when the plants were detopped just above the cob. Cob growth followed a sigmoid pattern and the highest dry weight per cob was obtained from the lowest plant density and from entire plants. The number of cobs/m 2 increased with increased plant density but detopping treatments did not give any significant difference in relation to densities. The number of grains/cob was highest with 33300 plants/ha but, among the detopping treatments, plants detopped just above the cob had the lowest number of grains/cob in both years. Weight of 1000-grain decreased with increasing plant density but it was increased by detopping plants just above the cob during 1988/89, although it was decreased in 1989/90. The highest apparent translocation of pre-silking reserves was obtained using densities of 44400 plants/ha but detopping treatments did not show any consistent effect, although the highest apparent translocation (20 %) and harvest index (58 %) were obtained from plants detopped just above the cob.

An experiment was conducted to evaluate the efficacy of micronutrients on performance of Onion cv. Sukhsagar at Nadia, West Bengal during 2017-2018.The experiment was laid out in RBD having four replication with six treatments each having FYM @ 20 t ha -1 , viz. T 1 (RDF + soil application of Zinc Sulphate @ 10.0 kg ha -1 ), T 2 (RDF+ foliar application of Zinc Sulphate @ 0.5% at 30 & 45 days after planting (DAP), T 3 (RDF+ soil application of Borax @ 10.0 kg ha -1 ), T 4 (RDF+ foliar application of Borax @ 0.25% at 30 & 45 DAP), T 5 (RDF+ Foliar application of Micronutrient Mixture i.e. iron-2.5%, boron-0.5%,zinc -3%, copper -1%and manganese-1% @ 0.5% at 30 & 45 DAP) and T 6 (control). Highest plant height (63.72 cm), number of leaves/plant (12.71), polar diameter (58.62 mm), equatorial diameter (46.88 mm), average weight (61.72 g) of bulb, yield ha -1 (266.80 q) and highest % (29.82

Piper betle L., (family-Piperaceae) commonly known as the betel vine is an important medicinal and recreational plant in Southeast Asia. Betel vine is a dioecious, evergreen, perennial creeper with glossy heart shaped leaves. The present study was executed to identify the suitable integrated nitrogen management on leaf yield, quality and economy of betel vine (Piper betle L.) cultivars in new alluvial zone of West Bengal. The field experiment was conducted at Horticulture Research Station, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal during the 2017-2018. The experiment was laid out in Rnadomized Block Design, replicated thrice with eight treatments of integrated nitrogen management. It was noted that treatments in combination with inorganic and organic sources of nitrogen produced better results than the treatments with sole application of organic source of nitrogen. The application of nitrogen from mustard oil cake and urea in 1:1 ratio (T 1 ) produced maximum leaf yield/ vine (86.45 leaves/ vine/ year), projected leaf yield (63.22 lakhs/ ha/ year), chlorophyll content of the leaves (52.30 SPAD value), Ascorbic acid content of leaves (3.07 mg/100g), essential oil content ( 65.50 mg/100g) and ß Carotene content of leaves (7.28 mg/100g) in Simurali Deshi (V 1 ). Maximum fresh weight (261.25 g) and dry weight (42.01 g) of 100 leaves were found in Halisahar Sanchi (V₃). Among all the sources of nitrogen Mustard oil cake 50% + Urea 50% (T₁) showed highest benefit and cost ratio in all the three cultivars.

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