Abstract
Abstract Crop response to fertilizer nitrogen (N) is dependent upon tillage management. This study was conducted to determine how tillage rotation influences non‐irrigated crop growth, N uptake and yield. The effects of tillage rotation, N rate and N timing schedule on early season dry matter production and N uptake, ear leaf N concentration at silking, and yield of corn [Zea mays (L.) Pioneer 3378] were investigated at Painter, VA, on an Altavista loam (fine‐loamy, mixed, thermic Aquic Hapludult). In 1986, maximum yields achieved in the 6‐year continuous no till (NT) [5.82 Mg/ha] and first year no till (AT) [5.64 Mg/ha] were significantly greater than that of the 6‐year continuous conventional till (CT) [3.67 Mg/ha], but no yield differences were obtained in the drier 1987 season. A higher rate of N fertilizer was required to obtain maximum yield in the first year no till (168 kg N/ha) than in the NT (112 kg N/ha) during 1986. Early 1986 N uptake and growth response with and without N at planting increased in the order CT < AT = NT and AT < CT < NT, respectively, indicating greatest immobilization of soil N occurred in the newly established no till soil. Lack of differences in critical ear leaf N values developed for NT and CT in each year imply that plant norms developed for one tillage system may accurately assess N status of corn grown under different tillage practices.
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Claims 8
Claim · model-written summary
In 1986, continuous no till yielded significantly more than continuous conventional till.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- 6‐year continuous no till (NT)e0
- Outcome
- maximum yieldse0
- Direction
- significantly greatere0
- Value
- 5.82 Mg/hae0
- Qualifier
- 3.67 Mg/hae0
- Comparator
- 6‐year continuous conventional till (CT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1986, maximum yields achieved in the 6‐year continuous no till (NT) [5.82 Mg/ha] and first year no till (AT) [5.64 Mg/ha] were significantly greater than that of the 6‐year continuous conventional till (CT) [3.67 Mg/ha]”
t0“corn”
Claim · model-written summary
In 1986, first year no till yielded significantly more than continuous conventional till.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- first year no till (AT)e0
- Outcome
- maximum yieldse0
- Direction
- significantly greatere0
- Value
- 5.64 Mg/hae0
- Qualifier
- 3.67 Mg/hae0
- Comparator
- 6‐year continuous conventional till (CT)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1986, maximum yields achieved in the 6‐year continuous no till (NT) [5.82 Mg/ha] and first year no till (AT) [5.64 Mg/ha] were significantly greater than that of the 6‐year continuous conventional till (CT) [3.67 Mg/ha]”
t0“corn”
Claim · model-written summary
The drier 1987 season showed no yield differences between tillage treatments.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- yield differencese0
- Direction
- no yield differencese0
- Qualifier
- drier 1987 seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but no yield differences were obtained in the drier 1987 season”
t0“corn”
Claim · model-written summary
First year no till required a higher fertilizer N rate for maximum yield than continuous no till in 1986.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- first year no tille0
- Outcome
- rate of N fertilizer was required to obtain maximum yielde0
- Direction
- highere0
- Value
- 168 kg N/hae0
- Qualifier
- 112 kg N/hae0
- Comparator
- NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A higher rate of N fertilizer was required to obtain maximum yield in the first year no till (168 kg N/ha) than in the NT (112 kg N/ha) during 1986”
t0“corn”
Claim · model-written summary
Early 1986 nitrogen uptake ranked CT below AT and NT.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- N uptakee0
- Direction
- increasede0
- Qualifier
- CT < AT = NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early 1986 N uptake and growth response with and without N at planting increased in the order CT < AT = NT and AT < CT < NT, respectively”
t0“corn”
Claim · model-written summary
Early 1986 growth response ranked AT below CT below NT.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- growth responsee0
- Direction
- increasede0
- Qualifier
- AT < CT < NTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early 1986 N uptake and growth response with and without N at planting increased in the order CT < AT = NT and AT < CT < NT, respectively”
t0“corn”
Claim · model-written summary
Critical ear leaf N values did not differ between NT and CT within either year.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- critical ear leaf N valuese0
- Direction
- Lack of differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lack of differences in critical ear leaf N values developed for NT and CT in each year”
t0“corn”
Claim · model-written summary
The authors infer that a plant N norm from one tillage system may assess corn N status in another.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- plant norms developed for one tillage system may accurately assess N statuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“plant norms developed for one tillage system may accurately assess N status of corn grown under different tillage practices”
The same questions in other papers
tillage · yield · Zea mays (maize)Positive and negative results
811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative
- positive
- no effect
- negative
1,095 papers more in this group
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.