Growth Rate and Yield of Two Tomato Varieties (Lycopersicon esculentum Mill) under Green Manure and NPK Fertilizer Rate Samaru Northern Guinea Savanna

Table 2

Chemical composition of Lablab green manure used at Samaru in 2010-2011 and 2011-2012.

Chemical composition	2010-2011	2011-2012
Total nitrogen (g kg^−1)	36.6	35.7
Total phosphorus (g kg^−1)	5.5	6.1
Potassium (g kg^−1)	10.8	12.0
Calcium (g kg^−1)	10.3	10.6
Carbon (%)	48.8	49.7
C : N ratio	13	14
Dry matter (g kg^−1)	456.5	460.5

Source: analyzed green manure sample at Soil science Department’s laboratory, A.B.U., Zaria.