Which of the following statement is/are the key principles of Zero Budget Natural Farming'?
1. Bijamrita - Seed Treatment using local cowdung and cow urine.
2. Mulching -Mulching to ensure favorable microclimate in the soil.
3. Jiwamrita - Use of biological fertilizers instead of chemicals fertilizers or chemical pesticides in the soil.
4. Waaphasa - Soil aeration
Select the correct statements