'मृदा प्रोटीन' सूचकांक (soil protein index), जो मिट्टी में आसानी से उपलब्ध जैविक नाइट्रोजन का प्रतिनिधित्व करता है, मुख्य रूप से किस विशिष्ट यौगिक वर्ग की सांद्रता का माप 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?