Abstract
Abstract The experimental layout, initial crop husbandry, preliminary girth measurements and yield results before and after the imposition of 2 years' shade and fertilizer treatments on the Amazon cacao Shade and Manurial Experiment (K2‐01) at Tafo are reported. In assessing the uniformity of the 4‐year‐old cacao stand analyses of data on girth measurements gave C.V. of 10.26% and 12.86% for subplot and main plots, respectively. These are remarkably lower and highly satisfactory compared with the C.V. of 57.75% for the corresponding yield. Statistical evaluation of variations between NPK fertilizer, block, cropping seasons, and shade effect is reported. The significant slope effect during the minor crop season was interpreted to be only a seasonal reflection of the probable variation in the available soil moisture. The shade effect of this experiment is compared with a similar and older experiment (Kl) at Tafo. The significant shade effect during the 1964/65 season in both cases varies with time of the year irrespective of the different shade trees. Shade, K, and PK fertilizer effects are highly significant with the dtshaded cacao yielding almost twice as the plots under heavy shade whilst the fertilizer is about 10% greater. “No shade” with PK treatment has the uniformly highest yield followed by the “medium shade” with PK and the least being “heavy shade” with PK fertilizer. Shade effect is well marked during the main cropping season while that of K is pronounced without overhead shade. There is a suggestion of rapid depletion of exchangeable K after 7 years of continuous cropping. The Amazon cacao on the WACRI series does not respond to the NPK fertilizer until it is over 5 years old.
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 13
Claim · model-written summary
Cacao girth subplot variation was 10.26%.
- Taxon
- cacao
Theobroma cacaot0 - Outcome
- C.V.e0
- Value
- 10.26%e0
- Qualifier
- subplote0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cacao”
e0“girth measurements gave C.V. of 10.26% and 12.86% for subplot and main plots, respectively”
Claim · model-written summary
Cacao girth main-plot variation was 12.86%.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- C.V.e0
- Value
- 12.86%e0
- Qualifier
- main plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cacao”
e0“girth measurements gave C.V. of 10.26% and 12.86% for subplot and main plots, respectively”
Claim · model-written summary
Cacao yield variation was 57.75%.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- yielde0
- Value
- 57.75%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cacao”
e0“C.V. of 57.75% for the corresponding yield”
Claim · model-written summary
The slope effect was significant in the minor crop season.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- slope effecte0
- Qualifier
- minor crop seasone0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cacao”
e0“The significant slope effect during the minor crop season”
Claim · model-written summary
Shade effects varied by time of year in the 1964/65 season.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- shade effecte0
- Direction
- variese0
- Qualifier
- 1964/65 seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cacao”
e0“The significant shade effect during the 1964/65 season in both cases varies with time of the year irrespective of the different shade trees”
Claim · model-written summary
Unshaded cacao yielded almost twice that under heavy shade.
- Taxon
- cacaoTheobroma cacaoe0
- Treatment
- dtshadede0
- Outcome
- yieldinge0
- Direction
- almost twicee0
- Value
- almost twicee0
- Comparator
- heavy shadee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dtshaded cacao yielding almost twice as the plots under heavy shade”
Claim · model-written summary
Fertilizer increased cacao yield by about 10%.
- Taxon
- cacaoTheobroma cacaot0
- Treatment
- fertilizere0
- Outcome
- fertilizere0
- Direction
- greatere0
- Value
- about 10%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fertilizer is about 10% greater”
t0“cacao”
Claim · model-written summary
No shade with PK had the highest cacao yield.
- Taxon
- cacaoTheobroma cacaot0
- Treatment
- “No shade” with PKe0
- Outcome
- yielde0
- Direction
- higheste0
- Comparator
- “medium shade” with PKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““No shade” with PK treatment has the uniformly highest yield followed by the “medium shade” with PK and the least being “heavy shade” with PK fertilizer”
t0“cacao”
Claim · model-written summary
Heavy shade with PK had the least cacao yield.
- Taxon
- cacaoTheobroma cacaot0
- Treatment
- “heavy shade” with PK fertilizere0
- Outcome
- yielde0
- Direction
- leaste0
- Comparator
- “medium shade” with PKe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0““No shade” with PK treatment has the uniformly highest yield followed by the “medium shade” with PK and the least being “heavy shade” with PK fertilizer”
t0“cacao”
Claim · model-written summary
Shade effect was pronounced in the main cropping season.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- Shade effecte0
- Direction
- well markede0
- Qualifier
- main cropping seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shade effect is well marked during the main cropping season”
t0“cacao”
Claim · model-written summary
K effect was pronounced without overhead shade.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- Ke0
- Direction
- pronouncede0
- Qualifier
- without overhead shadee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of K is pronounced without overhead shade”
t0“cacao”
Claim · model-written summary
Exchangeable K may be rapidly depleted after seven years of cropping.
- Taxon
- cacaoTheobroma cacaot0
- Outcome
- exchangeable Ke0
- Direction
- depletione0
- Qualifier
- after 7 years of continuous croppinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There is a suggestion of rapid depletion of exchangeable K after 7 years of continuous cropping”
t0“cacao”
Claim · model-written summary
Amazon cacao on the WACRI series did not respond to NPK until over five years old.
- Taxon
- cacaoTheobroma cacaoe0
- Treatment
- NPK fertilizere0
- Outcome
- responde0
- Direction
- does not responde0
- Qualifier
- over 5 years olde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Amazon cacao on the WACRI series does not respond to the NPK fertilizer until it is over 5 years old”
The same questions in other papers
shade · yield · Theobroma cacao (cocoa)Results differ
9 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- no effect
- negative
12 papers more in this group
See all 16 papers →fertilization · yield · Theobroma cacao (cocoa)Positive and negative results
5 papers in the same direction as this paper · 36 in the opposite direction
- positive
- positive
- positive
38 papers more in this group
See all 42 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.