Abstract
The low productivity of transitional red-brown earths for flood irrigated upland cropping is associated with their low infiltration rates and inadequate aeration of the root zone. The effect of the measured changes in the moisture and aeration profiles with surface and slotted gypsum applications on growth and development of a wheat crop was evaluated in a preliminary field study, on non-replicated plots.The patterns of changes in moisture profiles in the gypsum slotted plots were similar to those observed in the previous season, namely, deeper preferential wetting and faster internal drainage through the slots. This resulted in lower volumetric moisture contents in the slots and in the surface and subsurface layers between slots, compared to the non-slotted plots.The critical moisture contents were defined for each soil depth at which an air-filled porosity of 0.08 mm3 mm-3 was reached. For the transitional red-brown earth used in this study, air-filled porosity needs to be larger than 0.08 mm3 mm-3 to provide a soil pathway for oxygen flow to roots. The moisture profiles in the no-gypsum, surface gypsum and slotted gypsum plots measured throughout the cropping season indicated the period of time when oxygen flow through different soil layers was likely to be restricted. The moisture contents were higher than the critical value in the surface and subsurface layers of the non-slotted plots, particularly in the plot with no gypsum applications, during a period in winter with prolonged rainfall and low evapotranspiration rates. This resulted in reductions in the rates of phasic development, tillering, canopy closure and dry matter production and finally lower yields in the non-slotted plots, especially in the plot without gypsum. Differences in grain yields were mainly due to differences in the number of spikes m-2.During the second half of the growing season higher potential evapotranspiration, lower rainfall and accurate irrigation scheduling resulted in the moisture contents being maintained below the critical limits at all depths in all plots. Consequently, the two yield components which were determined during this period, namely, the number of kernels per spike and kernel weight, showed only slight variations between plots.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Non-slotted plots without gypsum had reduced rates of phasic development, tillering, canopy closure and dry matter production in wheat.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- surface and slotted gypsum applicationse0
- Outcome
- phasic development, tillering, canopy closure and dry matter productione1
- Direction
- reductionse1
- Qualifier
- during a period in winter with prolonged rainfall and low evapotranspiration ratese4
- Comparator
- non-slotted plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“surface and slotted gypsum applications on growth and development of a wheat crop”
e1“This resulted in reductions in the rates of phasic development, tillering, canopy closure and dry matter production and finally lower yields in the non-slotted plots, especially in the plot without gypsum”
e4“during a period in winter with prolonged rainfall and low evapotranspiration rates”
Claim · model-written summary
Non-slotted plots, especially without gypsum, gave lower wheat yields.
- Taxon
- wheatTriticum aestivume0
- Treatment
- gypsume1
- Outcome
- yieldse1
- Direction
- lowere1
- Qualifier
- especially in the plot without gypsume1
- Comparator
- non-slotted plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“surface and slotted gypsum applications on growth and development of a wheat crop”
e1“This resulted in reductions in the rates of phasic development, tillering, canopy closure and dry matter production and finally lower yields in the non-slotted plots, especially in the plot without gypsum”
Claim · model-written summary
Differences in wheat grain yield were mainly due to differences in the number of spikes per square metre.
- Taxon
- wheatTriticum aestivume0
- Outcome
- grain yieldse2
- Qualifier
- mainly due to differences in the number of spikes m-2e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“surface and slotted gypsum applications on growth and development of a wheat crop”
e2“Differences in grain yields were mainly due to differences in the number of spikes m-2”
Claim · model-written summary
The number of kernels per spike and kernel weight of wheat showed only slight variations between plots.
- Taxon
- wheatTriticum aestivume0
- Outcome
- the number of kernels per spike and kernel weighte3
- Qualifier
- showed only slight variations between plotse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“surface and slotted gypsum applications on growth and development of a wheat crop”
e3“the number of kernels per spike and kernel weight, showed only slight variations between plots”
The same questions in other papers
lime · yield · Triticum aestivum (wheat)Positive and negative results
32 papers in the same direction as this paper · 140 in the opposite direction
- positive
- positive
- positive
169 papers more in this group
See all 173 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.