Chowdhury Md Akhter Hossain, Sultana Taslima, Rahman Md Arifur, Chowdhury Tanzin, Enyoh Christian Ebere, Saha Biplob Kumar, Qingyue Wang
Dept. of Agricultural Chemistry, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.
Dept. of Agricultural Chemistry, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh.
Heliyon. 2020 Dec 15;6(12):e05718. doi: 10.1016/j.heliyon.2020.e05718. eCollection 2020 Dec.
L is widely cultivated in many countries due to its importance as an all-purpose herbal or medicinal plant. The growth and yield of this plant can be enhanced by application of fertilizer. It is expected that a higher and balanced nutrient supply will result in higher crop production maintaining soil health, which is possible when the applied fertilizers are done in way that is efficient. So, there is a need to understand the amount of applied and type of fertilizer that will give the best output for farmers and to formulate economical market products. This study was conducted to investigate the effect of N fertilizer on leaf yield, its uptake and requirement, critical concentration, use efficiency and economics of L. Plants were grown at six levels of N: 0, 40, 80, 100, 150 and 200 kg ha from urea and diammonium phosphate (DAP) following completely randomized design with three replicates under field condition. The highest values of yield and yield attributes and profit based on benefit cost ratio (3.81 for urea and 2.91 for DAP) were obtained with 150 kg N ha (urea) and 100 kg N ha (DAP). Leaf biomass yield increased by 18-128 % in urea-N and 30-139 % in DAP-N fertilized plant over control while DAP > urea by 7.59 %. Sucker production (mean number) was urea-N (4.95 Plant) > DAP-N (2.28 Plant). Both gel and leaf N concentration and uptake was highest at 200 kg ha for both sources. For 80 % leaf biomass yield, minimum requirement of N was 74.90 (urea) and 89.60 kg ha (DAP). Growth and yield parameters to N application exhibited significant and positive correlations. Critical leaf N concentration was 0.88% (DAP) and 0.90% (urea) while mean and maximum NUE was 34% and 64 % (urea) and 43% and 69% (DAP), respectively. Farmers can be advised to apply N at the rate of 150 kg ha from urea for producing economically higher yield and better-quality leaves.
由于其作为一种通用草药或药用植物的重要性，L在许多国家广泛种植。施用肥料可以提高这种植物的生长和产量。预计更高且均衡的养分供应将带来更高的作物产量，同时保持土壤健康，前提是所施用的肥料方式高效。因此，有必要了解能为农民带来最佳产出的肥料施用量和类型，并制定经济实惠的市场产品。本研究旨在调查氮肥对L的叶片产量、吸收和需求、临界浓度、利用效率及经济效益的影响。在田间条件下，按照完全随机设计，以尿素和磷酸二铵（DAP）设置六个氮肥水平：0、40、80、100、150和200千克/公顷，进行三次重复种植。基于效益成本比（尿素为3.81，DAP为2.91），150千克氮/公顷（尿素）和100千克氮/公顷（DAP）时获得了最高产量、产量属性和利润值。与对照相比，施用尿素氮的植株叶片生物量产量增加了18 - 128%，施用DAP氮的植株增加了30 - 139%，且DAP比尿素高7.59%。吸芽产量（平均数）为尿素氮（4.95个/株）> DAP氮（2.28个/株）。两种氮肥来源下，200千克/公顷时凝胶和叶片中的氮浓度及吸收量均最高。对于80%的叶片生物量产量，氮的最低需求量分别为74.90（尿素）和89.60千克/公顷（DAP）。氮素施用的生长和产量参数呈现显著正相关。临界叶片氮浓度分别为0.88%（DAP）和0.90%（尿素），平均和最大氮素利用效率分别为34%和64%（尿素）以及43%和69%（DAP）。可以建议农民以150千克/公顷的尿素施用量来实现经济上更高的产量和更好质量的叶片。
