The salt content of the soil in a field is an important parameter in a crop\'s s
ID: 108422 • Letter: T
Question
The salt content of the soil in a field is an important parameter in a crop's success The minerals in these salts provide nutrients for the growth of the plants, but too much salt can be detrimental to the plants' health as well. 1) For the conditions given below, find the annual change in salt concentration per hectare (10,000 m^2) in the soil. 2) If the maximum salt concentration a particular field could tolerate is 5.000 kg/ha, has the field reached this limit? The rainfall occurs entirely in winter and amounts to 30 cm, with a total salt concentration of 40 ppm. Capillary rise from shallow, saline ground-water occurs in the spring and fall, and amounts to 10 cm at a concentration of 1,000 ppm. 90 cm of irrigation water is applied during the summer growing season with a concentration of 400 ppm. Drainage occurs during the summer and amounts to 20 cm, with a soluble salt concentration of 800 ppm. Fertilizers and soil amendments add an additional 120 g/m^2 of soluble salts, while the crops use 100 g/m^2 of salts. Assume that the salt concentration at the beginning of the year was 1,000 kg/heater and that there is no salt generation or decomposition within the soil.Explanation / Answer
1)Area of land=10,000m2
The salt concentration at begining of the year=1000kg/hectare
After tha there is no salt generation or decomposition which means the level of salt remains same.
Given that the amount of salt the can tolerate=5000kg/ha
Adding the additional ppm,we get =40+1000+400+800=2240ppm
Now as the assumption that there is no increase or decrease in salt concentration takes place,the increase in ppm would not cause any change in concentration and it remains in 1000kg/hectare.