There is a wealth of data from long-term observation experimental sites in China and in other countries (Ai et al., 2012; Maillard and Angers, 2014) showing that continuous application of NP fertilizers plus organic materials including straw (Lu et al., 2009) and composts (Rasool et al., 2008), significantly increases crop yields and soil quality, particularly soil organic matter (SOM) content (Demelash et al., 2014).
There is a wealth of data from long-term observation experimental sites in China and in other countries (Ai et al., 2012; Maillard and Angers, 2014) showing that continuous application of NP fertilizers plus organic materials including straw (Lu et al., 2009) and composts (Rasool et al., 2008), significantly increases crop yields and soil quality, particularly soil organic matter (SOM) content (Demelash et al., 2014).
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