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16: Initial Screening for Persistence and Productivity of 20 Promising Native and Exotic Pasture Legume Species in Two Productive Contrasting Forage Grasses in Belize

Lazier, J.R. CABI PDF

16 Initial Screening for Persistence

and Productivity of 20 Promising Native and Exotic Pasture Legume Species in Two Productive Contrasting Forage

Grasses in Belize

J.R. Lazier*1

*Formerly International Livestock Centre for Africa

Abstract

In order to assess persistence and productivity of promising fodder legumes under the wet tropical conditions of central Belize on a black heavy clay soil, strips of 20 mainly locally collected accessions of fodder legumes (13 genera,

15 species) of potential were planted in three replicates on an upper terrace of the Belize River in established pastures of two grasses (Pangola grass, Digitaria eriantha and Para grass, Brachiaria mutica) under low and high levels of applied fertilizer. Observational data were acquired at 6-week intervals. Once the legumes were well established the plots were mob grazed at 6-week intervals and observations were taken immediately before and after. Legume establishment and persistence was best in Para grass, and Leucaena leucocephala cv. Peru and Stylosanthes guianensis were the most promising materials tested. Common Centro and three locally collected accessions (C. pubescens

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13; Botanical Composition and Nutritive Value of Selected Native Pastures in Belize

Lazier, J.R. CABI PDF

13 

Botanical Composition and Nutritive

Value of Selected Native Pastures in Belize

J.R. Lazier*1

*Formerly International Livestock Centre for Africa

Abstract

An initial assessment was undertaken of the productivity, nutrient value and botanical composition of eight representative native pastures on a range of clay soils, including three vertisols, in central Belize and the Belize River

Valley under wet tropical conditions. Regular harvests indicated that the productivity at all sites was very low, that palatable native legumes were present at low levels and that the native species, particularly Mesosetum angustifolium, the dominant grass at the more infertile sites, did not respond to fertilization either in yield or nutrient content. At all sites some of the nutrients essential for animal productivity were below minimal levels, particularly Cu, but also

P at all but one site. N, Ca, Mg and Zn also were limiting at some sites and harvests. The introduced legumes being tested in the trials at the sites also had lower than minimum levels of Cu but mainly higher than minimum levels of the other nutrients tested.

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11: Developing and Commercializing New Pasture Legumes for Clay Soils in the Semi-arid Rangelands of Northern Australia: The New Desmanthus Cultivars JCU 1–5 and the Progardes Story

Lazier, J.R. CABI PDF

11 

Developing and Commercializing

New Pasture Legumes for Clay Soils in the

Semi-arid Rangelands of Northern

Australia: The New Desmanthus Cultivars

JCU 1–5 and the Progardes Story

C.P. Gardiner

Abstract

Vast areas of semi-arid clay soil rangeland regions of northern Australia, such as the Mitchell Grass Downs Bioregion, have (until recently) no commercially available or adapted sown pasture legume. Other regions and land types with clay soils too, such as the Brigalow region, have had a very limited range of sown pasture legume species available. Low livestock productivity in northern Australia is largely due to low protein content and low digestibility of the diet during the dry season. An adapted pasture legume could ameliorate this problem and enhance the productivity and sustainability of the region’s grazing sector. Of all the legume species tested to date in this region, a number of Desmanthus species are the preeminent survivors and are proving to be well adapted.

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15: Forage Legume Adaptation Strip Trials in Belize

Lazier, J.R. CABI PDF

15 Forage Legume Adaptation

Strip Trials in Belize

J.R. Lazier*1

*Formerly International Livestock Centre for Africa

Abstract

Twenty-one plantings of 24 accessions of 18 promising forage species belonging to 13 genera were established as strips under two fertilizer levels in 15 native and improved pastures and plots in contrasting environments

(vertisols, planosols and podzols) under wet tropical conditions in central Belize to obtain an initial assessment of their potential under regular cutting and grazing. Observational methods were used to obtain data. At the seven upper Belize River Valley sites, Leucaena leucocephala and Codariocalyx gyroides had the best performance, followed by Calopogonium caeruleum, Centrosema plumieri and C. pubescens. At the four Low Pine Ridge sites the plants most consistently successful across the sites and fertilizer levels were the S. guianensis accessions and C. gyroides. However, C. caeruleum, C. pubescens and D. intortum, under the high fertilizer rate generally persisted and performed very well. On the Mountain Pine Ridge soils, performance at the three sites was poor without the application of marl. The most productive legumes were C. gyroides, D. intortum, P. phaseoloides and S. guianensis cv. Endeavour.

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9: Searching for Pasture Legumes for Heavy Clay Soils in the Australian Dry Tropics and Subtropics: IV. Evaluation in Western Queensland

Lazier, J.R. CABI PDF

9 

Searching for Pasture Legumes for

Heavy Clay Soils in the Australian Dry

Tropics and Subtropics: IV. Evaluation in

Western Queensland

R.L. Burt†

Abstract

Sixty-one accessions of 19 species belonging to nine genera potentially adapted to heavy clay soils in drier conditions were tested at six western Queensland sites in a range of climatic conditions in 13 experiments involving three trial designs: single strips (2), small swards (8) and transplants with initial irrigation (3). Growth, response to stresses and persistence of the plantings were recorded. Only Desmanthus species persisted at the sites, some surviving for many years. The characteristics of the Desmanthus species of interest and the importance of further collection of the variation in these species in order to enable their potential to be assessed and utilized are discussed, and suggestions of how this might be efficiently achieved are presented.

9.1  Introduction

There are very large areas of clay soils throughout the tropics and subtropics of the world, much of them being located in dry tropical to semi-arid and arid regions (Dudal and Bramao,

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