COMPACTAÇÃO DO SOLO E INTERVALO HÍDRICO ÓTIMO NO CRESCIMENTO DA PARTE AÉREA E PRODUTIVIDADE DA CULTURA DO MILHO
Bibliographic record
Abstract
COMPACTAÇÃO DO SOLO E INTERVALO HÍDRICO ÓTIMO NO CRESCIMENTO DA PARTE AÉREA E PRODUTIVIDADE DA CULTURA DO MILHO Onã da Silva Freddi; José Frederico Centurion; Ricardo Garcia Aratani; Amauri Nelson BeutlerDepartamento de Solos e Adubos, Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterináiras, Jaboticabal, SP, ona_freddi@yahoo.com.br 1 RESUMO O objetivo do trabalho foi avaliar a compactação do solo proporcionada pelo tráfego de tratores sobre o intervalo hídrico ótimo (IHO) e o crescimento e produtividade do milho em um Latossolo Vermelhode textura argilosa. Os tratamentos foram constituídos por cinco intensidades de compactação e quatro repetições em delineamento inteiramente casualizado. Foram coletadas amostras indeformadas de solo nas camadas de 0,02–0,05, 0,08–0,11, 0,15–0,18 e 0,22-0,25 mpara determinação da macroporosidade, microporosidade, porosidade total, densidade do solo, resistência à penetração e o IHO. Os parâmetros da cultura avaliados foram à altura das plantas e inserção da primeira espiga, o diâmetro do colmo, o número de espigas por planta, a massa seca das plantas e de 1000 grãos e a produtividade. A compactação do solo restringiu todos os parâmetros da cultura avaliados com exceção apenas para o número de espigas e a massa de 1000 grãos. O IHO foi reduzido pela resistência do solo à penetração mesmo no tratamento com solo preparado com densidade média de 1,12 Mg m-3. Apenas o tratamento com quatro passadas do trator de 11 Mg apresentou densidade do solo acima da densidade crítica determinada no IHO, que foi de 1,37 Mg m-3, no qual a produtividade de milho foi significativamente menor. UNITERMOS: Zea mays, resistência do solo à penetração, densidade do solo FREDDI, O. S.; CENTURION, J. F.; ARATANI, R. G; BEUTLER, A. N. SOIL COMPACTION AND LEAST LIMITING WATER RANGE ON CORN SHOOT GROWTH AND SEED PRODUCTIVITY 2 ABSTRACT The aim of this work was to evaluate the effect of soil compaction caused by tractor wheel traffic on the limiting water range (LLWR), shoot growth and levels of compaction and four replications in a completely randomized experimental design. Soil samples with preserved structure were collected in the layers: 0.02-0.05; 0.08-0.11; 0.15-0.18 and 0.22-0.25m to determine macroporosity, microporosity, total porosity, bulk density, resistance to penetration and LLWR. The evaluated corn parameters were: plant and first spike height, steam diameter, number of spikes per plant, plant dry matter, dry matter of 1000 seeds and seed productivity. The soil compaction restricted all corn parameters except the number of spikes per plant and dry matter of 1000 seeds. The LLWR was reduced by the soil resistance to penetration, even in the tilled soil with bulk density of 1.12 Mg m-3. Only the treatment with 11 Mg tractor, repeated four times on the area, demonstrated bulk density above critical bulk density in the LLWR that was 1.37 Mg m-3, where the seed productivity was significantly smaller. KEY WORDS: Zea mays, soil resistance to penetration, bulk density
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".