TY  - JOUR
AV  - public
A1  - Mupangwa, W T
A1  - Tagwira, F
TI  - Groundnut yield response to single superphosphate, calcitic lime and gypsum on acid granitic sandy soil
UR  - http://dx.doi.org/10.1007/s10705-005-0075-3
JF  - Nutrient Cycling in Agroecosystems
SN  - 1385-1314
PB  - Springer
N2  - Phosphorus and calcium are the major nutrients limiting groundnut production. The objectives were to determine (a) optimum application levels of P and Ca, and (b) compare the effectiveness of calcitic lime (40% Ca, 4.5% Mg) and gypsum (22% Ca, 17% S) as sources of Ca for groundnut grown on sandy soils. Field experiments were established in smallholder farming areas using four levels of P (0, 8.5, 17 and 34 kg ha-1) combined factorially with calcitic lime (0, 200, 400 and 800 kg ha-1) to give 16 treatments. Similar levels of P were combined factorially with gypsum (0, 100, 200 and 400 kg ha-1) to give sixteen treatments. Experiments were laid in a randomized complete block design with three replications. Phosphorus had a significant effect on groundnut yield at the majority of the experimental sites. Application of P at 8.5 kg ha-1 gave the optimum groundnut yield response. The optimum application rates for calcitic lime and gypsum were 200 and 100 kg ha-1. Gypsum and calcitic lime were not significantly different as sources of Ca for groundnut. Soil chemical properties were significantly improved following application of P and Ca sources
KW  - Calcitic lime
KW  -  Groundnut
KW  -  Gypsum
KW  -  Phosphorus
KW  -  Sandy soil
Y1  - 2005///
SP  - 161
ID  - icrisat5992
EP  - 169
VL  - 73
IS  - 2-3
ER  -