Abstract
There is a huge potential of upland for developing food crops to shortage the increase in rice production in Indonesia. Upland rice that adaptable to dry land could support national rice production. Among the limit factors of upland rice productivity in Indonesia are infertile land and cultivation practices. The purpose of the study was to find out the effect of microbial inoculant application combined with nitrogen (N) fertilizer dosage to the cultivation of upland rice Inpago LIPI Go4. The factorial experimental design with two factors was applied, namely the supply of microbial inoculant and the dosage of N fertilizer and, i.e., 0%, 50%, 100% N (200 kg ha-1 Urea). The inoculant comprises of Aspergillus niger, Trichoderma viride, and Azotobacter. Each treatment combination was repeated four times. The microbial inoculant treatment solely effects significantly plant height, tiller number, and panicle weight of the upland rice, whereas N dosage treatment solely influences significantly plant height and tiller number. There was no interaction significant effect of microbial inoculant and N fertilizer dosage to all growth, production, and content of leaf N parameters. The maximum production of the upland rice was 4499 kg ha-1, whereas the average production was 3816 kg ha-1 grain weight. The highest yield was obtained from the plant with the supply of microbial inoculant and the treatment of 50% N fertilizer (100 kg ha-1 Urea).
Highlights
The population growth of Indonesia is estimated at 24.4% from 258 million in 2015 to 321 million in 2050 (United Nations, 2015)
The highest upland rice plants at 7 weeks after planting (WAP) was resulted from 100% N fertilizer treatment (76.9 cm), whereas the lowest plant (64 cm) resulted from 0% N fertilizer treatment (Figure 1B)
Improved of upland rice plant growth induced by microbes could be due to its association with rice through the production of IAA, solubilization phosphate, and other mechanisms (Khan et al, 2017)
Summary
The population growth of Indonesia is estimated at 24.4% from 258 million in 2015 to 321 million in 2050 (United Nations, 2015). In consequence of the population increasing of the country is the rising of food consumption requirements. Most Indonesian societies consume rice as the main staple food. Rice consumption for 2017/2018 is maintained at 38.0 million tons in Indonesia, whereas the production of milled-rice was 37 million tons (Global Agricultural Information Network [GAIN], 2018). The country needs to increase the national rice production from new or more resources. Rice production in Indonesia generally resulted from lowland and irrigated areas, mostly in Java island. Indonesian agriculture cannot rely only on the irrigated lowland rice to support food production
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