Abstract
The objective of this work was to determine the effect of incorporation timing of the velvet bean (Stizolobium cinereum) (GM) on both organic broccoli yield and N status. Mineral N content in the soil, biologically fixed N recovery by broccoli, GM biomass decomposition and N release kinetics were also determined. Plots were fertilized with 12 Mg ha-1 of organic compost and received GM either at 0, 15, 30 or 45 days after transplant. Other treatments were compost (12 or 25 Mg ha-1), GM, mineral fertilizers and control (no fertilizer). The data were collected in four completely randomized blocks. GM decomposition increased mineral N content in soil as rapidly as mineral fertilizer or the supply of 25 Mg ha-1 of compost. The N half-life in GM (24 days) is smaller than the mass half-life (35 days) and the biological fixation contributed with 23.6% of N present in the aboveground biomass of broccoli. The result suggests a higher synchrony between the crop relative growth rate and N release from the GM when incorporated at crop early growth stage. The incorporation of GM until 15 days after transplanting replaces 50% of the highest compost dose, without yield loss.
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Claims 6
Claim · model-written summary
Green manure decomposition raised soil mineral N as rapidly as mineral fertilizer or high compost supply.
- Taxon
- broccoli
Brassica oleracea var. italicat0 - Treatment
- GM decompositione0
- Outcome
- mineral N content in soile0
- Direction
- increasede0
- Comparator
- mineral fertilizer or the supply of 25 Mg ha-1 of composte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“GM decomposition increased mineral N content in soil as rapidly as mineral fertilizer or the supply of 25 Mg ha-1 of compost.”
t0“broccoli”
Claim · model-written summary
N half life in green manure was 24 days.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- N half-life in GMe0
- Direction
- smallere0
- Value
- 24 dayse0
- Comparator
- mass half-lifee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N half-life in GM (24 days) is smaller than the mass half-life (35 days)”
t0“broccoli”
Claim · model-written summary
Mass half life in green manure was 35 days.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- mass half-lifee0
- Value
- 35 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N half-life in GM (24 days) is smaller than the mass half-life (35 days)”
t0“broccoli”
Claim · model-written summary
Biological fixation contributed 23.6% of nitrogen in broccoli aboveground biomass.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Outcome
- N present in the aboveground biomasse0
- Value
- 23.6%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the biological fixation contributed with 23.6% of N present in the aboveground biomass of broccoli.”
Claim · model-written summary
Early green manure incorporation appeared better synchronized with crop relative growth and nitrogen release.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- GM when incorporated at crop early growth stagee0
- Outcome
- synchrony between the crop relative growth rate and N releasee0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher synchrony between the crop relative growth rate and N release from the GM when incorporated at crop early growth stage.”
t0“broccoli”
Claim · model-written summary
Incorporating green manure by 15 days after transplanting replaced half the highest compost dose without yield loss.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- incorporation of GM until 15 days after transplantinge0
- Outcome
- yielde0
- Direction
- without yield losse0
- Value
- 50%e0
- Comparator
- highest compost dosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The incorporation of GM until 15 days after transplanting replaces 50% of the highest compost dose, without yield loss.”
t0“broccoli”
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