An analysis of the causes of variation in yield of wheat [in New Zealand].
1986
Kamal A.M.A. | Langer R.H.M.
Responses of autumn-sown wheat crops to various agronomic inputs for grain yield were investigated in 3 field experiments on Lincoln College Farms, New Zealand. The experiments produced grain yields ranging from 7 to 10 t/ha, and of them, experiment 2 produced the lowest amount of dry matter and grain yield. The semidwarf cultivars Rongotea produced the highest and Oroua the lowest grain yields, whereas the standard height Kopara gave similar yield to the other two cultivars. For Rongotea, grain size was the most influential yield component, and it was grain number plus grain size for Kopara and are number for Oroua. Grain yield was, in general, not much influenced by N application. A low population of 250 plants m-(2) improved yield and its components, but grain yield m-(2) remained unaffected. Irrigation from stem elongation period increased grain yield by 53%. Results emphasize the importance of weather and soil variables and manipulation of environmental factors for increased grain yields.
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