1. Which of the following is a macro nutrient ?.
2. The conversion nitrates to nitrogen gas by certain bacteria is known as
3. Microbial decay of plants and animal remains into simpler nitrogenous compound is referred as ------
4. Which of these is not a micro element?
5. The washing away of soil nutrient down below the reach of the root is called -----
6. Excess water is conducted away from the soil through ----
7. The type of irrigation which can be done on a gentle slope is called ----
8. The artificial application of water on farmland is referred as ---
9. Nutrients that are required by plants in large quantities are known as
10. Irrigation method that usually employ the use of perforated pipes under ground is -----
