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Now showing items 191-200 of 218
Fate of urine nitrogen applied to peat and mineral soils from grazed pastures
(Lincoln University, 1994)
This study has provided fundamental information on the fate of urine nitrogen (N)
when applied to pasture soils. In this work the three pasture soils used were a
Bruntwood silt loam (BW), an old well-developed (lime and ...
Tillage and water content effects on surface soil hydraulic properties and shortwave albedo
(Soil Science Society of America, 1993)
The modification of surface soil structure affects soil-water processes important in crop production and soil conservation. Effects of pretillage soil water content (PTSW) with multiple-pass tillage operations were determined ...
Application of isotopic dilution methods to the study of the dissolution of phosphate fertilisers of differing solubility in the soil
(Lincoln University, 1991)
An injection technique, in which undisturbed soil cores are labelled with ³²P to study dissolution of phosphate fertilisers in the soil, was evaluated in field and glasshouse trials. When ³²P was injected between 0-150 mm ...
Response of wheat cultivars to chlorsulfuron and the effect of nitrogen availability
(Lincoln University, 1993)
Sensitivity of wheat cultivars to the herbicide chlorsulfuron was tested and mechanisms to explain their differential response determined. In addition, a sensitive wheat cultivar, Rongotea, was selected and the effect of ...
Improved models of particle-size distribution: an illustration of model comparison techniques
(Soil Science Society of America, 1993)
We investigated a relatively unexplored area of soil science: the fitting of parameterized models to particle-size distribution (a subject more thoroughly explored in sedimentology). Comparative fitting of different models ...
Harvest index variability within and between field pea (Pisum sativum L.) crops
(Lincoln University, 1993)
The association between individual plant performance and seed yield variability within
and between field pea crops was investigated. In 1988/89 six F8 genotypes with
morphologically distinct characteristics were selected ...
The ecological effects of new roads : a literature review
(New Zealand Department of Conservation, 1998-06)
The brief was as follows: 1. identify and critically assess the impacts (during construction and use) of new roads on the natural environment, habitats and species in protected areas; 2. identify ways of mitigating impacts ...
Public policy and private incentives for livestock disease control
(Lincoln University. Commerce Division, 1997-11)
The widely recognized externalities associated with livestock disease control have prompted countries throughout the world to invest in centralized control schemes designed to lower disease prevalence. As disease levels ...
An optimal control model for pest management under bait-shyness
(Lincoln University. Commerce Division, 1996-12)
This paper presents a dynamic bioeconomic model of vertebrate pest management which
incorporates a behavioural trait in the target population known as toxin or bait avoidance. Pests who exhibit such avoidance after exposure ...
Quantification of phytosanitary barriers to trade
(Lincoln University. Commerce Division., 1998-09)
The Sanitary Phytosanitary Code (SPS) is an effort to reduce the technical barriers to trade created by phytosanitary regulations, or trade barriers related to plant and animal health. A key feature of SPS is risk assessment ...