randomized complete block design meaning in English

随机化完全区组设计

A randomized complete block design ( rcbd ) has been used under the field conditions to compare the effect of four treatments : 1 ) entire quantity of straw returned to the soil , but not cut into pieces ( treatment a ) , 2 ) half quantity of straw returned , not cut into pieces as in treatment a ( treatment b ) , 3 ) half quantity of straw cut into pieces returned ( treatment c ) , 4 ) ck ( treatment d ) , without any straw returned to the filed
田间实验采用随机区组法，分四种情况： 1 )全量整株稻草还田； 2 )半量整株还田； 3 )半量切碎还田4 )对照，即除根茬外无额外稻草还田四个处理。试验结果表明，除处理2外，所有处理对土壤有机质的影响不明显，但稻草还田处理降低了土壤的容重，这意味着土壤的孔隙度增加了。