Journal
AGRONOMY-BASEL
Volume 11, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/agronomy11020296
Keywords
root-lesion nematode; Pratylenchus thornei; N uptake; P uptake; nutrient deficiency; wheat development; subtropical environment; dryland wheat production; Triticum aestivum; vertisols; nematicides
Categories
Funding
- Department of Agriculture and Fisheries Queensland
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The study analyzed how rates of different nematicides and the use of NPZn fertilizer impact the growth and yield of wheat cultivars in a subtropical environment. Results showed that reducing the population densities of P. thornei through nematicides led to increased tillers, plant biomass, nutrient concentrations, spikes, kernels, and grain yield. Additionally, grain yield was negatively correlated with P. thornei densities in the root-zone soil, showing that reducing nematode populations early in crop growth can greatly increase yield.
Field experiments testing rates of various nematicides, with and without NPZn fertiliser, were analysed to investigate how root-lesion nematode (Pratylenchus thornei) affects growth and yield components of susceptible/intolerant wheat cultivars in a subtropical environment. Plant response to nematode attack was assessed by regression and principal components analyses of various plant parameters at different crop development stages, in relation to different nematode population densities in the roots and root-zone soil. Reduction in P. thornei population densities by nematicides resulted in increased numbers of tillers, plant biomass, N and P concentrations and uptakes, numbers of spikes and kernels, and grain yield. Grain yield was strongly correlated with number of kernels, biomass and number of spikes, and negatively correlated with number of P. thornei in the root-zone soil at stem elongation. This study showed that P. thornei damage to roots decreased wheat yield through limiting N and P concentrations and uptakes in plant tops causing poor growth that commenced early and continued through the life of the crop. Genetic, environmental and management factors that reduce population densities of P. thornei, and decrease the impact of the nematodes starting in early crop growth, will greatly increase spike and kernel numbers and grain yield.
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