Agriculture & Biology
recycling
98%
animal manures
98%
livestock
85%
farms
69%
nutrients
62%
crops
22%
social barriers
17%
urban farming
17%
farm surveys
14%
livestock farming
13%
water pollution
12%
urbanization
11%
sustainable development
11%
Ethiopia
11%
rural areas
10%
decision making
10%
developing countries
10%
imports
10%
statistics
9%
soil fertility
9%
fertilizers
7%
Earth & Environmental Sciences
manure
100%
livestock
98%
farm
88%
recycling
80%
nutrient
67%
crop
29%
livestock farming
12%
soil fertility
11%
import
10%
savings
10%
water pollution
10%
rural area
9%
allocation
9%
developing world
8%
fertilizer
8%
urbanization
8%
sustainable development
8%
decision making
7%
statistics
7%
demand
6%
land
5%
calculation
5%
distribution
3%