Abstract
An experiment was conducted at Dugda district in the Central Rift Valley of Ethiopia under field conditions to determine the impacts of tillage levels, N and P fertilizers on growth and yield of maize (Zea mays L.). Two tillage levels; (1) Conventional and (2) Minimum tillage and four N and P fertilizer levels; (1) No fertilizer (control treatment), (2) 64 kg N haG 1 (139 kg urea haG 1 ), (3) 20 kg P haG 1 (100 kg TSP haG 1 ) and (4) 64 kg N haG 1 +20 kg P haG 1 (100 kg DAP haG 1 + 100 kg urea haG 1 ) were laid out in split plot design by assigning tillage levels to the main plots and fertilizers to the subplots and replicating three times. Data collected on growth and yield parameters was analyzed using the GLM procedure of SAS Version 9.2. N and P fertilizers had highly significant effects on growth parameters: plant height and leaf area. They also significantly affected yield parameters: biomass yield and grain yield of maize but the effects of tillage levels as well as the interaction between tillage levels and fertilizers were not significant. For the majority of the growth and yield parameters, the treatment with 64 kg N haG 1 +20 kg P haG 1 (100 kg DAP haG 1 + 100 kg urea haG 1 ) outperformed the remaining three treatments. Accordingly, significant and highest plant height (178.24 cm), leaf area (431 cm 2 ), biomass yield (11925 kg haG 1 ) and grain yield (3678.8 kg haG 1 ) were obtained from the application of fertilizer treatment with 64 kg N haG 1 + 20 kg P haG 1 (100 kg DAP haG 1 +100 kg urea haG 1 ). The results of the correlation analysis also indicated that biomass yield was significantly and positively correlated with grain yield and grain yield was also significantly and positively correlated with harvest index. This indicated that N and P fertilizer treatments with higher biomass yield and harvest index could result in higher grain yield of maize. According to the current results, it can be concluded that N and P fertilizers significantly affected the growth and yield of maize but tillage levels have no significant effect. Therefore, the use of 64 kg N haG 1 +20 kg P haG 1 (100 kg DAP haG 1 +100 kg urea haG 1 ) and minimum tillage could be recommended for optimum growth and yield of maize and also save the precious soil, money and time of resource poor small holder farmers, of the study area.
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Claims 10
Claim · model-written summary
N and P fertilizers significantly affected maize plant height and leaf area.
Zea maysNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N and P fertilizers had highly significant effects on growth parameters: plant height and leaf area.”
t0“maize (Zea mays L.)”
Claim · model-written summary
N and P fertilizers significantly affected biomass and grain yield.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They also significantly affected yield parameters: biomass yield and grain yield of maize”
t0“Nitrogen and Phosphorus Fertilizers”
Claim · model-written summary
Tillage levels and their interaction with fertilizers had no significant effect on yield parameters.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“They also significantly affected yield parameters: biomass yield and grain yield of maize but the effects of tillage levels as well as the interaction between tillage levels and fertilizers were not significant”
t0“maize (Zea mays L.)”
Claim · model-written summary
The combined N and P treatment gave the highest plant height of 178.24 cm.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant and highest plant height (178.24 cm), leaf area (431 cm 2 ), biomass yield (11925 kg haG 1 ) and grain yield (3678.8 kg haG 1 ) were obtained from the application of fertilizer treatment with 64 kg N haG 1 + 20 kg P haG 1”
t0“maize (Zea mays L.)”
Claim · model-written summary
The combined N and P treatment gave the highest leaf area of 431 cm 2.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant and highest plant height (178.24 cm), leaf area (431 cm 2 ), biomass yield (11925 kg haG 1 ) and grain yield (3678.8 kg haG 1 ) were obtained from the application of fertilizer treatment with 64 kg N haG 1 + 20 kg P haG 1”
t0“maize (Zea mays L.)”
Claim · model-written summary
The combined N and P treatment gave the highest biomass yield of 11925 kg haG 1.
- Treatment
- 64 kg N haG 1 + 20 kg P haG 1e0
- Outcome
- biomass yielde0
- Direction
- higheste0
- Value
- 11925 kg haG 1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant and highest plant height (178.24 cm), leaf area (431 cm 2 ), biomass yield (11925 kg haG 1 ) and grain yield (3678.8 kg haG 1 ) were obtained from the application of fertilizer treatment with 64 kg N haG 1 + 20 kg P haG 1”
t0“maize (Zea mays L.)”
Claim · model-written summary
The combined N and P treatment gave the highest grain yield of 3678.8 kg haG 1.
- Treatment
- 64 kg N haG 1 + 20 kg P haG 1e0
- Outcome
- grain yielde0
- Direction
- higheste0
- Value
- 3678.8 kg haG 1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant and highest plant height (178.24 cm), leaf area (431 cm 2 ), biomass yield (11925 kg haG 1 ) and grain yield (3678.8 kg haG 1 ) were obtained from the application of fertilizer treatment with 64 kg N haG 1 + 20 kg P haG 1”
t0“maize (Zea mays L.)”
Claim · model-written summary
Biomass yield correlated positively with grain yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biomass yield was significantly and positively correlated with grain yield”
t0“maize (Zea mays L.)”
Claim · model-written summary
Grain yield correlated positively with harvest index.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield was also significantly and positively correlated with harvest index”
t0“maize (Zea mays L.)”
Claim · model-written summary
The authors recommend combined N and P fertilizer with minimum tillage for maize growth and yield.
- Treatment
- 64 kg N haG 1 +20 kg P haG 1 (100 kg DAP haG 1 +100 kg urea haG 1 ) and minimum tillagee0
- Outcome
- optimum growth and yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of 64 kg N haG 1 +20 kg P haG 1 (100 kg DAP haG 1 +100 kg urea haG 1 ) and minimum tillage could be recommended for optimum growth and yield of maize”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
286 papers in the same direction as this paper · 812 in the opposite direction
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See all 1,099 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.