The field experiment was carried out in 2015–2017 on a family farm in Toczyski Czortki, in the Mazovia voivodeship in Poland. The experiment was set up in a split–split–plot system in three replications. The area of one plot was 30 m⁻². The studied factors were: I—two maize varieties: PR38N86 (medium late hybrid cultivar 280 FAO), P8400 (medium early hybrid cultivar 240 FAO); II—four doses of nitrogen fertilization: 1. control object—without the use of nitrogen (0 kg N·ha⁻¹), 2. nitrogen dose—80 kg N·ha⁻¹ (applied once before sowing), 3. nitrogen dose—120 kg N·ha⁻¹ (applied once before sowing), 4. nitrogen dose—160 kg N·ha⁻¹ (applied once before sowing); III—four types of biostimulants used: 1. control object—without using a biostimulant, 2. Asahi^®SL biostimulant: I term—four-leaf phase (BBCH 14) at a dose of 0.60 dm³∙ha⁻¹, II term—eight-leaf phase (BBCH 18) at a dose of 0.60 dm³∙ha⁻¹, 3. Improver^® biostimulant: I term—four-leaf phase (BBCH 14) at a dose of 1.00 dm³∙ha⁻¹, II term—eight-leaf phase (BBCH 18) at a dose of 0.60 dm³∙ha⁻¹, 4. Zeal^® biostimulant: I term—six-leaf phase (BBCH 16) at a dose of 2.00 dm³∙ha⁻¹. The aim of the study was to determine the effect of nitrogen fertilization and the use of biostimulants on the size and quality of yield of two varieties of maize grown for grain. Based on the conducted research, it was found that nitrogen doses influenced the amount of maize grain obtained. The highest yields were obtained using 120 kg N∙ha⁻¹. Nitrogen doses significantly affected the studied maize yield components. The dose of 120 kg N∙ha⁻¹ increased the number of grains in the cob, while the dose—160 kg N∙ha⁻¹ exerted the best effect on obtaining the highest values of a thousand seeds. The biostimulants used in the experiment significantly affected the mass of one thousand seeds and the number of grains in the cob. In addition, Asahi^®SL, Improver^® and Zeal^® biostimulants increased maize yield in each growing season studied.

中文翻译：

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氮肥和生物刺激剂的使用对两个玉米栽培品种（Zea mays L.）产量的影响

实地试验于2015–2017年在波兰Mazovia省的Toczyski Czortki的一个家庭农场进行。实验是在拆分-拆分-绘图系统中进行的，共分三个重复。一幅图的面积为30 m ^-2。研究的因素是：I-两个玉米品种：PR38N86（中晚杂交品种280 FAO），P8400（中早杂交品种240 FAO）；II-四剂氮肥：1.对照物-不使用氮（0 kg N·ha ^-1），2.氮素剂量-80 kg N·ha ^-1（播种前施用一次），3.氮剂量—120千克N·ha ^-1（播种前施用），4.氮剂量—160千克N·ha ^-1（播种前施用一次）；III-四种类型的生物刺激的使用：1.控制对象，而无需使用生物刺激，2。朝日^® SL生物刺激：在剂量为0.60 I项-四叶阶段（BBCH 14）分米³ ∙公顷^-1，II术语-eight叶阶段（BBCH 18），剂量为0.60分米³ ∙公顷^-1，3改良剂^®生物刺激：在剂量为1.00 DM I项-四叶阶段（BBCH 14）³ ∙公顷^-1，术语II-八叶阶段（BBCH 18），剂量为0.60分米³ ∙公顷^-1，4热心^®生物刺激：I项-六叶阶段（BBCH 16），剂量为2.00分米³ ∙公顷^{- 1个}。该研究的目的是确定氮肥的施用和生物刺激剂的使用对两种谷物种植玉米品种的大小和产量质量的影响。根据进行的研究，发现氮剂量影响获得的玉米籽粒的量。使用120 kg N∙ha ^-1可获得最高产量。氮剂量显着影响所研究的玉米产量组成。120 kg N∙ha ^-1的剂量增加了穗轴的粒数，而160 kg N∙ha ^-1的剂量在获得最高千粒种子方面发挥了最佳效果。实验中使用的生物刺激剂显着影响了1000粒种子的质量和穗轴中的谷粒数量。此外，朝日^®SL，改良剂^®和热心^®生物刺激增加在研究每个生长季节玉米产量。