Field experiments were carried out in split plot design during the dry and wet seasons for two years (two seasons each in 2016–2017 and 2017–2018) with two genotypes (SH4 and SUIN053), two plant geometry (30×15 cm and 45×15 cm main plots) and three levels of NPK (20 kg N ha⁻¹, 40 kg P ha⁻¹ and 40 kg K ha⁻¹; 20 kg N ha⁻¹, 60 kg P ha⁻¹ and 60 kg K ha⁻¹; 20 kg N ha⁻¹, 80 kg P ha⁻¹ and 80 kg K ha⁻¹) with an objective to study the relationship between fibre yield of sunhmep and thermal indices. The results indicated that the thermal units such as cumulative heat unit (CHU), photo thermal unit (PTU) and helio thermal unit (HTU) were the highest during dry seasons, while relative temperature disparity (RTD) was the highest during wet seasons irrespective of the genotypes, plant geometry and fertilizer levels. The combined analysis of variance showed that the suitability of sunnhemp genotypes for obtaining fibre and seed yields varied with season. The results further indicated that sunnhemp grew during dry seasons with longer photoperiod and higher values of growing degree days (GDD), HTU and PTU resulted in a higher fibre yield, while a higher seed yield and relatively longer, finer and stronger fibres were obtained during wet seasons with higher RTD values. Regression analysis indicated that CHU was positively related to fibre yield, while RTD was positively related to seed yield. CHU beyond 2 000 °C d reduced seed yield and favoured fibre production. In contrary to CHU, RTD values were positively related to seed yield and negatively related to fibre yield. Similarly, HTU had an inverse relationship with fibre yield while PTU had a positive relationship with fibre yield. The genotype SH4 produced a seed yield of 1 361 kg ha⁻¹ during wet seasons, which was significantly higher than SUIN053, while a fibre yield of 990 kg ha⁻¹ (significantly higher than that of SH4) was obtained for SUIN053 that required less CHU to attain the phenological events during dry seasons. The per unit area yields of seed and fibre with the closer spacing (30 cm×15 cm) by virtue of higher plant density were 17.0 and 14.9% higher than those with the spacing of 45 cm×15 cm, respectively. Higher doses of P and K resulted in higher seed and fibre yields.

田间试验在干湿季节进行两年（2016-2017 和 2017-2018 各两个季节）的裂区设计，具有两种基因型（SH4 和 SUIN053）、两种植物几何形状（30×15 cm 和 45 ×15 cm 主地块）和三个水平的 NPK（20 kg N ha ^-1、40 kg P ha ^-1和 40 kg K ha ^-1；20 kg N ha ^-1、60 kg P ha ^-1和 60 kg K ha ^-1 ; 20 kg N ha ^-1 , 80 kg P ha ^-1和 80 kg K ha ^-1) 目的是研究 sunhmep 的纤维产量与热指数之间的关系。结果表明，干季累积热量单位（CHU）、光热单位（PTU）和日光热单位（HTU）等热量单位在旱季最高，而相对温差（RTD）在雨季最高。基因型、植物几何形状和肥料水平。综合方差分析表明，晒麻基因型获得纤维和种子产量的适宜性随季节变化。结果进一步表明，晒麻在干旱季节生长，光周期较长，生长度日（GDD）、HTU和PTU值较高，纤维产量较高，而种子产量较高，相对较长，在雨季获得更细、更强的纤维，具有更高的 RTD 值。回归分析表明，CHU 与纤维产量呈正相关，而 RTD 与种子产量呈正相关。CHU 超过 2 000 °C d 会降低种子产量并有利于纤维生产。与 CHU 相反，RTD 值与种子产量呈正相关，与纤维产量呈负相关。同样，HTU 与纤维产量呈负相关，而 PTU 与纤维产量呈正相关。基因型 SH4 的种子产量为 1 361 kg ha RTD 值与种子产量呈正相关，与纤维产量呈负相关。同样，HTU 与纤维产量呈负相关，而 PTU 与纤维产量呈正相关。基因型 SH4 的种子产量为 1 361 kg ha RTD 值与种子产量呈正相关，与纤维产量呈负相关。同样，HTU 与纤维产量呈负相关，而 PTU 与纤维产量呈正相关。基因型 SH4 的种子产量为 1 361 kg ha^-1在雨季显着高于 SUIN053，而 SUIN053 获得的纤维产量为 990 kg ha ^-1（显着高于 SH4），在旱季需要更少的 CHU 来实现物候事件。植株密度较近（30 cm×15 cm）的种子和纤维单位面积产量分别比45 cm×15 cm的高17.0%和14.9%。较高剂量的磷和钾导致较高的种子和纤维产量。