This research article was published by MDPI, 2020
Tobacco (Nicotiana tabacum L.) is associated with great uptake of soil macronutrients.
Following the need to understand the macronutrients levels before and after tobacco cultivation,
research was conducted in loamy sand soil of Sikonge, Urambo, and sand soil of Tabora, Tanzania.
The initial macronutrients levels in the soil were compared with those measured after unfertilized
and fertilized tobacco. Results showed that unfertilized tobacco plant influences the increase of
nicotine to the rhizosphere, the macronutrients Ca (135%) > N (25%), decrease in the order of S (81%)
> P (49%) > Mg (12%) > K (11%). The sole e↵ect of nitrogen–phosphorus–potassium (NPK) and
calcium–ammonium–nitrate (CAN) 27% fertilizers increased further nicotine, Ca (25%) > N (20%) > S
(8%) > Mg (4%) > P (3%), and decreased K (3%) in the rhizosphere. Both tobacco plant and NPK +
CAN fertilizers on the rhizosphere increased Ca (193%) > N (50%) and decreased S (80%) > P (48%) >
K (14%) > Mg (8%). Leaf concentrations in fertilized tobacco increased Ca (197%) > K (28%) > P (27%)
> S (26%) > N (18%) > Mg (12%). Therefore, tobacco plant increases soil N and Ca but decreases P, K,
Mg, and S.