Grazing studies on the Guadalcanal Plains, Solomon Islands 1. Climate, soils, and soil fertility assessment

Watson S.E. and Whiteman P.C. (1981) Grazing studies on the Guadalcanal Plains, Solomon Islands 1. Climate, soils, and soil fertility assessment. The Journal of Agricultural Science, 97 2: 341-351. doi:10.1017/S0021859600040776


Author Watson S.E.
Whiteman P.C.
Title Grazing studies on the Guadalcanal Plains, Solomon Islands 1. Climate, soils, and soil fertility assessment
Journal name The Journal of Agricultural Science   Check publisher's open access policy
ISSN 1469-5146
Publication date 1981-01-01
Sub-type Article (original research)
DOI 10.1017/S0021859600040776
Volume 97
Issue 2
Start page 341
End page 351
Total pages 11
Subject 1102 Cardiovascular Medicine and Haematology
1103 Clinical Sciences
1311 Genetics
Abstract The Guadalcanal Plains encompass approximately 460 km2 with both forest and grassland phases. Mean annual rainfall is 2160 mm, with a drier season from June to October, but soil moisture deficits seldom occur. Soils are freely to imperfectly drained brown loam to clays (Ustropepts). Soil analyses show available P concentrations of 15-17 μg/g, adequate K, Cu, Zn and Mn, and high Ca and Mg, but sulphate sulphur is low. A nutrient omission trial gave significant negative responses to the omission of P, K, S and Mo. However, responses to P applications were not obtained in the field with Centrosema pubescens, but significant responses to K and S were found under a cut and remove system. Yield response in the grasses Brachiaria decumbens and B. mutica to applied N was markedly limited in the absence of applied S, even though B. mutica was able to maintain S concentrations in herbage at 2-3 times those of B. decumbens. Without applied S, S contents and N:S ratios in B. decumbens were inadequate for beef cattle, but adequate in B. mutica except at high N inputs (300 kg/ha/year). Application of 40 kg S/ha to the legume C. pubescens increased yields by approximately 50%, reduced incidence of Cercospera leaf spot, and gave increased N concentrations. For establishment of sown mixed pastures on the Guadalcanal Plains we recommend the basal application of 20 kg P/ha, 50kgK/ha, 30 kg S/ha and 0-15 kg Mo/ha, with 30 kg S/ha applied every 2 years.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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