1.2.3 land pollution due to agricultural waste Population growth pressures require increased food needs, growing food, and to enhance the exploitation of the soil fertility by several measures: strengthening the use of chemicals such as fertilizers, pesticides, herbicides, growth stimulant use reduced losses and create resources for harvest , expand irrigation systems.However in fertilizers and plant protection drugs (HERBICIDE) are often available heavy metals and hard substance decomposes, when accumulated to a certain limit, they will become pollutants.-Comparison with other countries with modern agricultural economies in the world, the weight of the water is low, but it is a cause of land pollution, water is due to:+ Fertilizer use efficiency in our country is still low: Protein reaches 30-45%, Australia 40-45%, potassium 40-50%. The amount of manure losses in 2007 was 1455.1 thousand tons (814, 5.103 tonnes N, 330, 7.103 tonnes P, 309, 10,020 tons of K).+ No fertilizing all: too much fertilizer in plain and too little in the Middle, mountains. The amount of fertilizers depending on the economic conditions of each household.+ Incorrect technique, fertilizing: fertilizer is mainly of fertilizer on the ground, the paddy fields so easy to lose. If fertilizer inclusions will increase effective fertilizing reaches 70-80%.+ Manure relative: most farmers who use too much nitrogen to fertilizer for crops, while P and K low again. The ratio of fertilizer N, P, K for serious imbalance (10:3: 1), this proportion of the world's 10:4: 3 (2003) the amount K used in our country are very low. The fertilizing imbalance will reduce the efficiency of fertilizer for crops and the bad influence to soil quality.+ Quality of manure does not guarantee: many types of fertilizer itself contains many toxic substances:. For example, impurities in superphophat
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