| dc.description | Agriculture is the single most important sector of the economy of Bangladesh, where
many crops like rice, wheat, maize, jute, pulses, sugarcane, oil seeds, vegetables etc
are grown well. Maize (Zea mays L.) is one of the leading cereal crops of the world. It
originates from sub-tropical regions, probably from the highlands of Mexico and nowa-days it is a leading crop in many temperate regions (Miedema, 1982). Maize is
presently a major crop among the cereals of Bangladesh because of it’s the highest
yield potentiality and use. The crop is well suited to the existing agro-climatic
condition and cropping patterns of Bangladesh and it can help in attaining selfsufficiency in food to a great extent. The production area of maize is increasing day
by day. Presently the crop covers an area of about 50 thousand acres and produves 27.
thousand metric ton in this countrf (BBS 2004). Jn Bangladesh, yearly acreage and
production of maize has been gradually increased (appendix 1). | en_US |
| dc.description.abstract | The study was conducted in the Research Field and Laboratory of the
Department of Crop Physiology and Ecology, Hajee Mohammad Danesh
Science and Technology University, Dinajpur during the period of March to
July 2007, to investigate the growth and yield of maize in relation to population
densities and different nitrogen levels. Three population nsity) viz.,
D, (5 plant/m’), D, (7.5 plant/m’) and D; (10 plant/m’) and four levels of
nitrogen value viz., No (no nitrogen), N; (90 kg/ha), No (180 kg/ha) and N3 (270
kg/ha) were used. The experiment was laid out in a Randomized Complete
Block Design (RCBD) with three replications. From the study it was observed
to attain most of phenological stages of maize required maximum days on D3.
The duration of seedling emergence, tasseling, cob intiation, pollen shading,
silking and maturity required the highest days on D; condition. Present study
also revealed that differences in planting density significantly influenced TDM,
LAI, LAD, CGR, RGR and NAR. Nitrogen levels also influenced the above
growth parameters significantly. The results also feveleg that higher planting
density with N; gave the highest values of all the growth parameters.
Chlorophyll content was significantly influenced due to variation in planting
density. Planting density in D, gave the highest values of chlorophyll content.
Nitrogen levels also significantly influenced the chlorophyll content. Reverse
with chlorophyll content accumulation was increased with decreasing of
nitrogen levels. Leaf dry weight, stem dry weight and ear dry weight were
significantly influenced by different planting density. Planting density in D,
gave the highest value of the above parameters. Nitrogen levels also significantly influenced the above parameters. Reverse with leaf dry weight,
stem dry weight and ear dry weight were increased with decreasing of nitrogen
levels. Significantly higher plant height, yield (3.37 t/ha) and harvest index was
found in D3 condition and the lowest yield (59 t/ha) was obtained in D,
condition while leaf number, ear length, ear diameter, number of ear/plant,
number of grain rows/ear, number of grains/row, number of grains/ear and
1000-grain weight showed a reverse result with D, condition. Nitrogen levels
also significantly influenced yield and yield attributes. The highest yield (3.65
t/ha) was obtained from the plant growing with N3 while the lowest yield (2.04
t/ha) was found from No. The interaction between planting density and different
nitrogen levels showed a significant variation among the growth, yield and
yield attributes of maize. It is indicated that D3; with N3 showed the best
performance in respect of growth, yield attributes and yield of maize. | en_US |
