The hardness and density of high yielding soils were lower than those of the controlplot soils.
高产稻田土壤硬度和容重比对照田块的低。
2
The results showed that there was little difference in the yield of rice or its economic properties between the fertilized and the controlplot.
结果表明：不论何时施用穗肥，其产量与不施稳肥的比较，无明显不同；
3
The insect community stability of the plot of the longest organic management time was the best, while the controlplot of conventional management was the worst.