1.Pakistan experiences generally low rainfall, ranging from 125 mm per year in upper Sindh to approximately 900 mm in the northern sub-mountainous regions. In Balochistan, the average yearly precipitation is around 200 mm, decreasing to about ________ mm in the Kharan desert area:
2.Which of the following is NOT considered a loss of soil water?
3.What is the proportion of igneous, metamorphic, and sedimentary rocks in the Earth's crust?
4.Approximately what percentage of the Earth's crust is made up of oxygen and silicon combined?
5.What is the approximate percentage of potassium (K) found in the Earth's crust?
6.Where is Nitrophos produced in Pakistan?
7.Where does the National Fertilizer Corporation (NFC) produce all Single Super Phosphate (SSP) and some Nitrophos fertilizers locally?
8.Which of the following are the primary phosphatic fertilizers used in Pakistan?
9.Besides being a source of essential nutrients for plants, what additional roles does Soil Organic Matter (SOM) fulfill?
10.Humus is composed of decomposed organic matter that has undergone multiple cycles of breakdown and synthesis. Humic substances are a group of highly acidic, yellow to black colored, high molecular weight compounds __________________, which can be isolated through various extraction methods:
11.Which element is found as a constituent in both nucleic acids and proteins?
12.At what temperature are soil samples typically dried for gravimetric soil analysis?
13.What does the term 'rhizosphere' refer to?