Abstract
We evaluated five varieties of cassava for yield, N accumulation and their effect on soil chemical properties. Soil phosphorus content increased drastically after 14 months of crop growth while soil organic carbon, N and exchangeable K contents reduced during the same period. Fresh root yield ranged from 17 t ha-1 to 35.9 t ha-1, while total dry matter production also ranged from about 18 t ha-1 to about 25 t ha-1. Total N accumulation in the total plant biomass varied from about 228 kg N ha-1 to about 288 kg N ha-1. The amount of total N uptake exported from the soil through crop harvest ranged from about 59 kg N ha-1to about 123 kg N ha-1 while the total N uptake recycled into the soil through the return of crop residue ranged from 127 kg N ha-1 to about 189 kg N ha-1. The study suggests that cassava varieties with high root dry matter yield have the potential of exporting large quantities of nutrients from the soil while varieties with high leaf litter deposition is likely to recycle substantial amount of the plant nutrient uptake. Key words: Biomass, leaf litter, nutrients, root dry matter, soil chemical properties.
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Claims 9
Claim · model-written summary
Soil phosphorus content increased after 14 months of cassava growth.
- Taxon
- cassava
Manihot esculentat0 - Outcome
- Soil phosphorus contente0
- Direction
- increased drasticallye0
- Qualifier
- after 14 months of crop growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil phosphorus content increased drastically after 14 months of crop growth while soil organic carbon, N and exchangeable K contents reduced during the same period.”
t0“cassava”
Claim · model-written summary
Soil organic carbon, N and exchangeable K decreased over that period.
- Taxon
- cassavaManihot esculentat0
- Outcome
- soil organic carbon, N and exchangeable K contentse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil organic carbon, N and exchangeable K contents reduced during the same period”
t0“cassava”
Claim · model-written summary
Cassava fresh root yield ranged from 17 to 35.9 t ha-1.
- Taxon
- cassavaManihot esculentat0
- Outcome
- Fresh root yielde0
- Direction
- rangede0
- Value
- 17 t ha-1 to 35.9 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fresh root yield ranged from 17 t ha-1 to 35.9 t ha-1”
t0“cassava”
Claim · model-written summary
Total dry matter production ranged from about 18 to 25 t ha-1.
- Taxon
- cassavaManihot esculentat0
- Outcome
- total dry matter productione0
- Direction
- rangede0
- Value
- about 18 t ha-1 to about 25 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total dry matter production also ranged from about 18 t ha-1 to about 25 t ha-1”
t0“cassava”
Claim · model-written summary
Total plant biomass accumulated about 228 to 288 kg N ha-1.
- Taxon
- cassavaManihot esculentat0
- Outcome
- Total N accumulation in the total plant biomasse0
- Direction
- variede0
- Value
- about 228 kg N ha-1 to about 288 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Total N accumulation in the total plant biomass varied from about 228 kg N ha-1 to about 288 kg N ha-1.”
t0“cassava”
Claim · model-written summary
Crop harvest exported about 59 to 123 kg N ha-1 of total N uptake.
- Taxon
- cassavaManihot esculentat0
- Outcome
- total N uptake exported from the soil through crop harveste0
- Direction
- rangede0
- Value
- about 59 kg N ha-1to about 123 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total N uptake exported from the soil through crop harvest ranged from about 59 kg N ha-1to about 123 kg N ha-1”
t0“cassava”
Claim · model-written summary
Crop residue returned 127 to about 189 kg N ha-1 of total N uptake to soil.
- Taxon
- cassavaManihot esculentat0
- Outcome
- total N uptake recycled into the soil through the return of crop residuee0
- Direction
- rangede0
- Value
- 127 kg N ha-1 to about 189 kg N ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total N uptake recycled into the soil through the return of crop residue ranged from 127 kg N ha-1 to about 189 kg N ha-1”
t0“cassava”
Claim · model-written summary
High root dry matter yielding cassava varieties may export large quantities of soil nutrients.
- Taxon
- cassavaManihot esculentae0
- Material
- cassava varietiese0
- Outcome
- exporting large quantities of nutrients from the soile0
- Direction
- highe0
- Qualifier
- have the potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cassava varieties with high root dry matter yield have the potential of exporting large quantities of nutrients from the soil”
Claim · model-written summary
High leaf litter deposition varieties are likely to recycle substantial nutrient uptake.
- Taxon
- cassavaManihot esculentat0
- Material
- varietiese0
- Outcome
- recycle substantial amount of the plant nutrient uptakee0
- Direction
- highe0
- Qualifier
- is likelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“varieties with high leaf litter deposition is likely to recycle substantial amount of the plant nutrient uptake”
t0“cassava”