increasing of soil fertility meaning in English

提高土壤肥力

Pac increased correspondingly with the increase of soil fertility while pac decreased with the increase of soil depth
随土壤肥力提高， pac相应提高；但同一土壤中随土层加深， pac呈下降趋势。
The variation of pi was little in the soils with three fertilities . and the proportion of pi in total p decreased while the proportion of po went up with the increase of soil fertility
不同肥力土壤无机磷量差异较小，随土壤肥力提高，无机磷占全磷比例下降，但有机磷量及其占全磷的比例显著增加。
That is to say , there was enrichment tendency for phosphorus , especially for po , with the increase of soil fertility . pi mainly occurred in ca - p forms in which ca10 - p made up most in 58 % ~ 61 % , while the amount of ca2 - p was very lower . po exists mainly in the form of mid - labile po ( around 66 % ~ 69 % )
在磷素的各种形态中，无机磷形态以钙磷为主，其中以难溶性的ca _ ( 10 ) - p占大多数，达58 - 61 ，而有效性强的ca _ 2 - p等较少；有机磷形态以中度活性有机磷为主，占66 - 69 。