Despite the benefits of no-till practices, soil compaction is a problem that can cause, among other things, mechanical impediment to root growth and less response to soil fertilization. The objective of this study was to evaluate the effect of subsoiling and doses of phosphate fertilization on soybean that have been cultivated over ten years under no-till systems in the Brazilian Cerrado. The experiment consisted of a randomized complete block design in a 2 × 4 factorial arrangement. Two managements in consolidated no-tillage area were considered: with and without subsoiling, along with four levels of phosphate fertilization: 0, 100, 300 and 400 kg ha-1 of P2O5. The practice of subsoiling in an area with ten years of no-till system provided an increase of 124.38 kg ha-1 in soybean productivity. Soybean plants grown under no-tillage system, with subsoil management, showed better development and pod production. The maximum phosphorus efficiency, with subsoiling, was achieved with the dose of 172 kg ha-1 of P2O5, yielding 5,693.4 kg ha-1. In the no-tillage system, the maximum efficiency dose and crop yield were 159 kg ha-1 of P2O5 and 5434.2 kg ha-1, respectively.
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机译：尽管有免耕做法的好处，但土壤压实是一个问题，除其他因素外，它可能导致根系生长的机械障碍和对土壤施肥的反应减少。这项研究的目的是评估在巴西Cerrado的免耕系统下种植十年的大豆的深松和磷肥施用量的影响。实验由2×4析因排列的随机完整块设计组成。考虑了合并免耕区的两个管理措施：有或没有深耕技术，以及磷肥的四个施肥水平：P2O5的0、100、300和400 kg ha-1。在十年免耕系统下进行深层耕作的做法使大豆生产力提高了124.38 kg ha-1。在免耕制度下种植的，具有地下土壤管理能力的大豆植物表现出更好的发育和豆荚产量。在172 kg ha-1的P2O5剂量下，达到最大的磷效率，并进行深层耕作，得到5,693.4 kg ha-1。在免耕系统中，最大有效剂量和作物产量分别为159 kg ha-1的P2O5和5434.2 kg ha-1。
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