当前位置: X-MOL 学术Environ. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Monitoring nitrogen leaching under different fertiliser applications during the early growth stage of sugarcane using GS3 sensors: a case study on Negros Island, Philippines
Environmental Technology ( IF 2.8 ) Pub Date : 2021-07-08 , DOI: 10.1080/09593330.2021.1942558
Toshihiko Anzai 1 , Tadaomi Saito 2 , Koji Inosako 2 , Shinkichi Goto 3 , Shotaro Ando 1 , Ken Okamoto 1 , Ignacio S Santillana 4
Affiliation  

ABSTRACT

Nitrogen (N) is normally applied twice during sugarcane cultivation on Negros Island in the Philippines. As the first application is carried out during the early growth stage, there is a high possibility that N is not absorbed sufficiently by the sugarcane and a large amount of N may be leached with percolating water. To investigate this leaching, we monitored the vertical movement of soil water and soil solutes using GS3 dielectric moisture and electrical conductivity (EC) sensors in a sugarcane field on Negros Island. The monitoring was conducted after the first N application at different application rates (50% or 100% of the recommended rate) and timings (immediately or 30 days after planting [DAP]). The EC values increased when 100%-N was applied immediately after planting, indicating that N leached into the deeper soil layer. The monitoring results suggest that the applied N did not remain in the root zone (due to leaching) and was not replenished until the second application, when the absorption ability of the sugarcane was high. Conversely, when 100%-N was applied at 30 DAP, the applied N remained in the root zone until the second application. When 50%-N was applied at 30 DAP, the increase in EC was small compared to the 100%-N application. These results indicate that applying N immediately after planting at the recommended rate led to an insufficient nutrient supply for the sugarcane, as well as the loss of N fertiliser via leaching.



中文翻译:

使用 GS3 传感器监测甘蔗生长早期不同肥料施用下的氮浸出:以菲律宾内格罗斯岛为例

摘要

在菲律宾内格罗斯岛的甘蔗种植过程中,通常施用两次氮 (N)。由于第一次施用是在生长初期进行的,N 很可能没有被甘蔗充分吸收,大量的 N 可能被渗滤水浸出。为了研究这种浸出,我们在内格罗斯岛的甘蔗田中使用 GS3 介电湿度和电导率 (EC) 传感器监测土壤水和土壤溶质的垂直运动。在第一次施氮后以不同的施用率(推荐施用率的 50% 或 100%)和时间(种植后立即或 30 天 [DAP])进行监测。当种植后立即施用 100%-N 时,EC 值增加,表明 N 浸出到更深的土壤层中。监测结果表明,施用的氮没有留在根区(由于浸出),直到第二次施用时才补充,此时甘蔗的吸收能力很高。相反,当在 30 DAP 施用 100%-N 时,施用的 N 保留在根区直到第二次施用。当在 30 DAP 施用 50%-N 时,与 100%-N 施用相比,EC 的增加很小。这些结果表明,在种植后立即以推荐的施用量施氮会导致甘蔗的养分供应不足,以及氮肥因淋失而损失。当在 30 DAP 施用 100%-N 时,施用的 N 保留在根区直到第二次施用。当在 30 DAP 施用 50%-N 时,与 100%-N 施用相比,EC 的增加很小。这些结果表明,在种植后立即以推荐的施用量施氮会导致甘蔗的养分供应不足,以及氮肥因淋失而损失。当在 30 DAP 施用 100%-N 时,施用的 N 保留在根区直到第二次施用。当在 30 DAP 施用 50%-N 时,与 100%-N 施用相比,EC 的增加很小。这些结果表明,在种植后立即以推荐的施用量施氮会导致甘蔗的养分供应不足,以及氮肥因淋失而损失。

更新日期:2021-07-08
down
wechat
bug