Abstract
In 1977 and 1978, the optimum yam population density and level of fertilization for a yam-maize mixture were investigated at Umudike, Eastern Nigeria. Six yam population densities (5.0, 7.5, 10.0, 12.5, 15.0 and 17.5 × 103 stands ha-1) and five fertilizer levels (0, 164, 328, 492 and 656 kg ha 1 of 9:4.5:18 N-P-K mixture) were used. The yam was Dioscorea rotundata cv. 'Obiaoturugo'; maize was planted at 33 000 stands ha-1. Intercropping reduced tuber yields (29%) and tuber size (20%) but improved land equivalent ratios LER (66%). Fertilizing at 656 kg ha 1 increased tuber yields (29%), tuber size (30%) and LER (36%). Increasing yam plant density from 5000 to 17 500 stands ha-1 increased tuber yields (147%), LER (87%) but reduced tuber size (22%). Recommended fertilizer rate and yam population density for yam-maize intercropping were 420-440 kg ha-1 and 12 500 stands ha-1, respectively.
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Claims 10
Claim · model-written summary
Intercropping reduced yam tuber yield by 29%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e1“Intercropping reduced tuber yields (29%) and tuber size (20%)”
Claim · model-written summary
Intercropping reduced yam tuber size by 20%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e1“Intercropping reduced tuber yields (29%) and tuber size (20%)”
Claim · model-written summary
Intercropping improved land equivalent ratio (LER) by 66%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e1“Intercropping reduced tuber yields (29%) and tuber size (20%)”
e2“but improved land equivalent ratios LER (66%)”
Claim · model-written summary
Fertilizing at 656 kg ha 1 increased yam tuber yield by 29%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e3“Fertilizing at 656 kg ha 1 increased tuber yields (29%), tuber size (30%) and LER (36%)”
Claim · model-written summary
Fertilizing at 656 kg ha 1 increased yam tuber size by 30%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e3“Fertilizing at 656 kg ha 1 increased tuber yields (29%), tuber size (30%) and LER (36%)”
Claim · model-written summary
Fertilizing at 656 kg ha 1 increased land equivalent ratio (LER) by 36%.
Not reportedComparator
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e3“Fertilizing at 656 kg ha 1 increased tuber yields (29%), tuber size (30%) and LER (36%)”
Claim · model-written summary
Increasing yam density from 5000 to 17 500 stands ha-1 increased tuber yield by 147%.
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e4“Increasing yam plant density from 5000 to 17 500 stands ha-1 increased tuber yields (147%), LER (87%) but reduced tuber size (22%)”
Claim · model-written summary
Increasing yam density from 5000 to 17 500 stands ha-1 increased land equivalent ratio (LER) by 87%.
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e4“Increasing yam plant density from 5000 to 17 500 stands ha-1 increased tuber yields (147%), LER (87%) but reduced tuber size (22%)”
Claim · model-written summary
Increasing yam density from 5000 to 17 500 stands ha-1 reduced tuber size by 22%.
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e4“Increasing yam plant density from 5000 to 17 500 stands ha-1 increased tuber yields (147%), LER (87%) but reduced tuber size (22%)”
Claim · model-written summary
A fertilizer rate of 420-440 kg ha-1 and a yam population of 12 500 stands ha-1 are recommended for yam-maize intercropping.
Verbatim
t0“Yam-maize intercropping investigations in Nigeria”
e5“Recommended fertilizer rate and yam population density for yam-maize intercropping were 420-440 kg ha-1 and 12 500 stands ha-1, respectively”
The same questions in other papers
fertilization · yield · DioscoreaResults differ
13 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- no effect
13 papers more in this group
See all 17 papers →intercropping · yield · DioscoreaPositive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 papers →density · yield · DioscoreaResults agree
2 papers in the same direction as this paper
- positive
- positive
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.