सामान्य कृषि योग्य (खेती की जाने वाली) मृदा का कार्बन से नाइट्रोजन (C : N) अनुपात आमतौर पर किस सीमा में होता है?

Which of the following factors are responsible for soil degradation in dryland areas? (a) Lack of precipitation (b) Low clay content in soil (c) High soil organic matter content in soil (d) High soil erosion

What is the primary agricultural benefit of including leguminous crops, such as pulses, in a crop rotation system?