Technical annual report 2000-01
Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
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Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals
Dept. of Primary Industry and Fisheries
Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295
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Technical Annual Report 2000/01 49 Method: On 6 January 2000 seeds of five pasture legume species were planted in paddock 50 at DDRF. The area was lightly disturbed using a trash worker cultivator to encourage seed to contact soil after crash grazing. Trial area: 4 ha total Treatments: Control - buffel only (Cenchrus ciliaris) Wynn cassia (Chamaechrista rotundifolia) Verano stylo (Stylosanthes hamata) Oolloo (Centrosema brasilianum) Maldonado (Macroptilium gracile) Milgara Blue pea (Clitoria ternatea) Plot layout: 4 replicates, each randomised. Plot size: 130 m x 12 m Fertiliser: 50 kg/ha Goldphos 20 December 1999 45 kg/ha 0-11-0-14 applied at seeding. Weed control: Broad leaf weeds were controlled by using Starane as a post planting/pre-emergent herbicide. Grazing: No grazing during establishment in the first Wet season to allow legumes to set seed. Recordings: Botanal In each plot botanal was used to determine plants present, the percentage of each and pasture yield. (November and May each year) Plant samples Taken from each plot to estimate the yield of buffel grass and legume and the proportion of each. Plant samples were also prepared and submitted to the Chemistry Section to be analysed for nutrient content. Soil samples: A single sample was taken from each plot to compare the differences in soil nutrient levels for the six treatments. Results: During the first season, all legumes established well, the most prolific ones being Milgara Blue pea, Oolloo and Maldonado. Wynn cassia and Verano stylo were less prolific than the twinning legumes. Verano, Wynn and Blue pea all seeded well although Oolloo and Maldonado seeded poorly. During the second season, all legumes again established and grew well. Results from the April 2001 harvest yields showed that the greater the legume content, the higher was the overall yield, but grass yield was lower. Oolloo mix had the highest overall yield and the control had the lowest overall yield. Results are given in Table 1. Table 1. Plant yields Treatments Mean overall yield (kg/ha) Mean legume yield (kg/ha) Mean grass yield (kg/ha) Buffel % nitrogen Oolloo/Buffel 10,103 8,128 1,975 0.975 Wynn/Buffel 9,364 6,461 2,903 0.633 Maldonado/Buffel 9,154 5,661 3,493 0.670 Milgara/Buffel 5,555 1,784 3,771 0.558 Verano/Buffel 4,251 364 3,886 0.533 Buffel only 4,070 4,070 0.590 Grazing: Steers were grazed between July 2000 and June 2001 at 1 head/hectare. Results from the species evaluation trial show the buffel legume mixed pasture in Pdk 50 produced the highest overall steer liveweight gain over the 12 months and 9.2% higher than a pasture mix of buffel/Sabi only. Plant samples harvested in April 2001 showed the percentage of nitrogen in the buffel grass was significantly higher in the Oolloo treatments. No significant differences however, were found in the December and May 2000 plant samples between treatments or replications.