Morphological characterization and yield of pepper ( Piper nigrum L.) types grown in Morogoro District, Tanzania

Table 2 Chemical and physical properties of soil (0–20 cm depth) in study sites

Soil property	Optimum value	Farm 1	Farm 2	Farm 3
Chemical properties
pH	4.75–6.25	5.95^MA	6.09^SLA	6.25^SLA
OC	2.0–7.5%	2.78^OP	2.45^OP	2.33^OP
Tot. N	0.2–0.5%	0.19^L	0.17^L	0.22^OP
Bray P	12–96 ppm	10.20^L	11.45^L	11.28^L
Exch. K⁺	91–286 ppm	0.22^D	0.85^D	0.81^D
Exch. Ca²⁺	61–139 ppm	0.59^D	0.80^D	0.60^D
Exch. Mg²⁺	40–194 ppm	0.95^L	1.50^L	1.10^L
DTPA Fe	12–65 ppm	81.19^H	38.20^OP	37.10^OP
DTPA Mn	5–35 ppm	62.39^H	57.26^H	56.29^H
DTPA Zn	2.1–7.0 ppm	4.43^OP	3.32^OP	2.96^OP
DTPA Cu	0.51–7.7 ppm	1.56^OP	2.81^OP	3.52^OP
Physical properties
Soil particle size density (P.S.D)	%Clay	39.2	37.2	39.22
	%Silt	10.82	9.82	9.82
	%Sand	49.96	52.96	50.96
	Texture class	Sandy clay	Sandy clay	Sandy clay

L, low; H, high; D, deficient and OP, optimum Srinivasan et al. (2007). MA, moderately acidic and SLA, slightly acidic (Landon 1991)

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