Abstract

In this study, a new agrotextile structure containing ammonium and nitrate fertilizers which is called controlled release fertilizer (CRF) was designed. The prepared structure was used in lettuce growth trials both in the absence and presence of dimethylpyrazole phosphate (DMPP) inhibitor. In order to better monitor nitrogen balance in the soil and total nitrogen amounts in the whole system including soil, plant, and agrotextile and thus revealing the efficacy of DMPP usage depending on fertilizer application type ((traditional (TF) or agrotextile (CRF)) and irrigation regime (100% and 50%), plants were harvested at three growth stages. Generally, independent of fertilizer application type, the effect of DMPP usage was more pronounced at 100% irrigation regime. Presence of DMPP and 100% irrigation in traditional fertilizer (TF) application increased soil ammonium nitrogen (NH₄⁺-N) by 12.5% and 11.1% and decreased soil nitrate nitrogen (NO₃^--N) by 3.8% and 8.9% at 1^st and 2^nd harvest stages, respectively. DMPP usage in agrotextile (CRF) application with 100% irrigation improved NH₄⁺-N by 353% and reduced NO₃^--N by 14.9% in the soil, when especially the 2^nd harvest stage was considered. According to soil N results, it can be said that the DMPP usage increased the soil inorganic N content in both TF and CRF applications. But, plant N uptake results showed that the usage of DMPP either didn’t change or worsen the nitrogen use efficiency in the TF and CRF applications, respectively.

摘要

在这项研究中，设计了一种新型的含有铵和硝酸盐肥料的农用纺织品结构，称为控释肥料（CRF）。在不存在和存在磷酸二甲基吡唑（DMPP）抑制剂的情况下，所制备的结构均用于生菜生长试验中。为了更好地监控土壤中的氮平衡以及整个系统（包括土壤，植物和农用纺织品）中的总氮含量，从而揭示根据肥料施用类型（（传统（TF）或农用纺织品（CRF））使用DMPP的功效）在100％和50％的灌溉制度下，植物在三个生长阶段收获，通常，与肥料施用类型无关，在100％灌溉制度下DMPP的使用效果更为明显。₄ ⁺ -N）分别降低了12.5％和11.1％，并且在收获的^第一个和^第二个阶段分别使土壤硝酸盐氮（NO ₃ ^-- N）降低了3.8％和8.9％。在特别考虑^第二收获期的情况下，在100％灌溉的农用纺织品（CRF）应用中使用DMPP可使土壤中的NH ₄ ⁺ -N改善353％，将NO ₃ ^-- N减少14.9％。根据土壤氮的结果，可以说在TF和CRF施用中DMPP的使用均增加了土壤无机N的含量。但是，植物对氮的吸收结果表明，在TF和CRF应用中，DMPP的使用没有改变或恶化了氮的使用效率。