In order to contrast agricultural loadings among all of countries, soil school put forward an expression of index of agricultural loading that Z=any national L÷American L.
Through calculation, index of agricultural loadings of above-maintained countries are as following.
US China Brazil India Russia Singapore
1 4.78 0.21 1.83 0.19 infinite
According to these results, we can see that Chinese agricultural loading is American 4.78 times, Indian 2.61 times, Russia and Brazil are about American 1/5, Singapore is infinite, but it is exception, because such a little country it has enough food only by a shipping in grain. Here only in order to compare.
Although these two figures are not perfect to express agricultural loading, because of lack of other factors to influence agricultural loading particularly such as climate, soil, water resources and so on. But as attempting after all this first step is going forward.
(to be proofread)