Table 1 to 5 showed the results of the reseach observation as the output of statistical calculations. The tables describe the results of NFE, crude fiber, crude protein, energy and crude fat.
Table 1 showed genotype and crop age interaction on NFE for all treatments. Based on genotypic variance and crop age, the NFE showed significant differences. The genotypes gave different percentages of NFE at various harvest ages. The genotype and crop age interaction on NFE content (% NFE) reached the highest on genotype G1 (50.9767%) at 100 days and did not differ from genotype G1 at 90 days (49.8233%), G2 at 100 days (49.823%), G3 at 90 days (48.4233%) and G3 at 100 days (49.6817%). In the Same age of 90 days, the genotype G2 (47.5567%) had NFE significantly lower than G1 (49, 8233%) and G3 (49.4233%). High NFE levels in 100 days of harvest was may be due to the accumulation of sugar in the stems and the corn seed cause a sweet taste. These carbohydrates will increase the NFE levels in the forage. In young plants (80 days) the NFE was significantly lower than old plants (100 days). According to
Rochana et al., (2016), NFE levels are strongly influenced by forage nutrient content.
Plants grow on field can express their genotypic advantages very well. According to Ruswandi and Syafi’i (2016) the genotypic adaptation produce different responses based on the environment. Research by
Ilmawan (2017) shows that corn crop environment affects the age of harvest. The results of
Ammodu et al., (2014) study showed that Shimaz Corn NFE content of 91 DAP was 53.6% and significantly lower than WASA Corn 1 NFE (56.6%). Harvest at 105 DAP, the Shimaz NFE content (49.1%) was significantly lower than WASA 1 NFE (52.1%). Likewise the harvest at 119 DAP, Shimaz NFE (48.1%) was significantly lower than WASA 1 NFE (51.7%).
Table 2 showed the genotype and harvest age interaction on crude fiber content. The results of variance showed that corn forage crude fiber was strongly influenced (P <0.05) by genotype and age of harvest. The genotypes gave different percentages of crude fiber at various harvest ages. The highest crude fiber was found in G2 at 80, 90 and 100 days witch were 31.3350%, 31.9167% and 32.6433% respectively and did not differ to G3 at a crop age of 100 days (32.1250%). Interaction of genotype and crop age for G3 (VAR B DR14xDR18) showed the crude fiber increased with increasing crop age. According to
Haryani et al., (2018) the crude fiber increases as the crop age increase. Opinions from
Lemaire and Belanger (2020) suggest that analysis of genetic and environmental variations helps a better understanding of genotype-environment-management-production interactions and forage quality. The results of
Hajar et al., (2019) showed that Sorghum crude fiber forage gave different value for different varieties. Variety 12 FS9006, 13FB7001 and 12549001 reached 30.12%, 28.09% and 31.71% respectively.
Table 3 showed the average crude protein content of Corn forage G1 (DR10xDR18 1x4), G2 (MDR741xDR18 3x4) and G3 (VarBDR14xDR18) were similar and they were 8.8978%, 8.8339% and 8.4706% respectively. Average crude proteins for various ages reached the highest at 80 DAP. The crude protein content of 80 DAP, 90 DAP and 100 DAP were 9.7122%, 8.9656% and 7.5244% respectively. This was in line with
Haryani et al., (2018) that crude protein content is inversely proportional to grass age. The crude protein content decreases with increasing cutting age. According to
Burton et al., (1967), the quality of forage decreases with increasing crop age. The genotype and crop age interactions are not significantly different. The results of
Amasaib et al., (2016) explained that genotype had no effect on crude protein content of
Cyamopsis tetragonoloba (Guar), namely the Gm1 and Gm3 genotypes. The forage with a high nutrient can be recommended for ruminants. Therefore, to produce high nutritional need to increase the nutrient intake of plants
(Susilawati et al., 2019).
According to
Turano et al., (2016), the crude protein of Pearl millet grass x Napier grass hybrids 2 (PMN2), PMN3, 5344 and 4604 are the similar of 6.4%, 7.0%, 7.9% and 7.9% respectively. The results of
Hajar, et al., (2019) showed that the crude protein of sorghum 12 FS9006, 13FB7001 and 12549001 variety were 6.62%, 6.47% and 9.18% respectively. In the study of
Vaswani et al., (2016) the crude protein of Corn forage HTHM 5101, DHM 117 and HM variety were 8.39%, 6.56% and 7.09% respectively. In the study of
Tufail et al., (2020) Agaitii Berseem 2002 genotype was superior compared to LBFI (Landrace produced by local farmers) and LBMI (Landrace sold locally in the agricultural market) genotype. Agaitii Berseem 2002 produced the best quality forage if harvested at 65, 110 and 150 DAP.
There were significant variations for green forage energy among the maize genotypes (Table 4). According to Ruswandi and Syafi’I (2016) each genotype has different character in responding to their environment. Furthermore according to
Ullmann et al., (2017) forage quality can be determined by genotypic and phenotypic.
Miller et al., (2014) explain that for growing plants need to consider genetic variations in phenotypic plasticity to compare input substances and other environmental variables.
The average energy of the Corn forage on genotypes G1 (DR10xDR18 1x4), was significantly lower (2921.22 kcal) than G2 (MDR741xDR18 3x4) (3001.33 kcal) and G3 (VarBDR14xDR18) (3018.83 kcal). The average energy for various corn ages did not differ significantly at 80 DAP, 90 DAP and 100 DAP, which were 2970.11 kcal, 2988.78 kcal and 2082.50 kcal respectively. In the results of
Turano et al., (2016) study, the forage energy content for Pearl millet x Napier grass 2 (PMN2) hybrid, PMN3 hybrid and 5344 hybrids are the same at 1700 kcal/kg and 4604 hybrid has 1600 kcal/kg.
In Table 5, the average crude fat G1 genotype (DR10xDR18 1x4) was significantly lower than G2 (MDR741xDR18 3x4) and was not significantly differ to G3 (VarBDR14xDR18) with were 5.6872%, 6.3422% and 5.8644% respectively. Average crude fats for various Corn ages were not significantly differ among 80 DAP, 90 DAP and 100 DAP, witch were 5.8789%, 6.0906% and 5.9244% respectively. The results of
Indriani et al., (2018) the fat of corn crops of 8x14 genotype was 3.46% and was significantly different than others 21 genotypes.