Longevity of green foxtail seeds in a canadian

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75 Introduction Bangladesh is an agricultural country. Rice, wheat, and maize are the main cereals grown in the country, and jute, sugarcane, potato, pulses, and tobacco are the principal crops. Rice is the staple food of about 150 million people of Bangladesh. Maize is the third most important cereal crop in Bangladesh, after rice and wheat. It can be cultivated year-round. Rice provides nearly 48.1% of rural employment, about two-thirds of the total calorie supply, and about one- half of the total protein intake of an average person in the country. The rice sector contributes half of the agricultural GDP, and a sixth of the national income in Bangladesh. Almost all of the 13 million families involved in farming within the country grow rice. Rice is grown on about 10.5 million hectares, a figure which has remained relatively stable over the past three decades. About 75% of the total cropped area and over 80% of the total irrigated area is planted with rice. Thus, rice plays a vital role in the livelihood of the people of Bangladesh. The population of Bangladesh is still growing by two million every year, and may increase by another 30 million over the next 20 years. During this time, the total rice area will shrink to 10.28 million hectares. Rice yields, therefore, need to increase from the present 2.74 t/ha to 3.74 t/ha (BRKB, 2010). Yet, to meet the food requirements of the population estimated for 2015, an additional 5 million tons of grain needs to be produced from the continuously decreasing agricultural lands (BRKB, 2010). Bangladesh experiences four distinct seasons, namely winter (Jan-Feb), summer (March-May); the southwestern summer monsoon (June-September) and the post-monsoon season, due to northeastern monsoons. Summer monsoons significantly affect the use of natural resources in the area. Monsoons start in mid April/May (mostly during June-Sept) and stay up until October. This period accounts for 80% of the total rainfall. The average annual rainfall varies from 1,429 to 4,388 mm. But in the Rangpur CSISA- Dinajpur hub (northwestern Bangladesh), the domain had a rainfall average of 2,237 mm (1,340-3,147mm)

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