Assertion: cowpea's nitrogen | /r/HasProperty | maria
Facets:
Source sentences:
text: Nitrogen and phosphorus are the most limiting nutrients on smallholder farms in Mozambique (Folmer et al., 1998; Maria and Yost, 2006) but due to limited availability of fertilizers in farming communities partly as a result of the poor infrastructure for marketing and the high cost if available, farmers cannot afford.