Upland rice is an alternative rice producer for lowland rice. Mulching is an alternative agronomic technique for increasing upland rice productivity. The purpose of this study is to modify plant media by utilizing mulch to increase growth and yield of upland rice. The study uses factorial randomized block design with three replications. The first factor are upland rice varieties namely Red Sigambiri, IPB 8G and IPB 9G. The second factor are mulches namely Silver Black Plastic Mulch,
Keywords: Upland ricemulchgrowthyield
Upland rice has been widely cultivated in Indonesia compared to lowland rice. National rice production in 2013 amounted to 70.87 million tons of milled dry grain and has increased by 1.81 million tons (2.62%) when compared to 2012. The increase in the rice production was estimated to occur in Java by 0.87 million tons and outside of Java by 0.94 million tons. Production increase may be due to the increase by 2.41 % (324.39 thousand ha) of harvested area, and 0.19 % (0.10 kw/ha) of productivity (BPS, 2013). However, continuous availability from year to year cannot be ascertained due to the increasingly narrow fertile land and current conditions of climate change.
An effort to overcome the problem in upland rice cultivation is by mulching. In addition to Silver Black Plastic Mulch, mulch can also come from organic materials such as rice straw or weeds that are commonly found on dry land. According to Sutanto (2003), the use of organic matter can improve soil physical, chemical and biological properties so that the health and preservation of land can be well maintained for sustainable agricultural activities.
Mulch is commonly used to cover soil surface around plants to create suitable conditions for growth (Bhardwaj & Yadav, 2012). Mulching can reduce the growth of weeds on land to prevent competition between cultivated plants and weeds. Mulching can also maximize sunlight reception absorbed by plants for optimal growth. Mulching is intended to maintain the microclimate around plants such as temperature and humidity so that plants can grow at an optimum (Multazam, 2014).
Upland rice productivity is lower than lowland rice due to the increasingly narrow fertile land and current climate change conditions.
Can mulch increase the growth and yield of upland rice varieties?
Purpose of the Study
The purpose of this study is to increase growth and yield of upland rice varieties by modifying the plant media using different kinds of mulch.
The study was conducted at the Experimental Farm, Faculty of Agriculture, Islamic University of North Sumatra, Gedung Johor Medan from June 2018 to October 2018.
This study used a Factorial Randomized Block Design (RBD) with three replications. The first factor was upland rice varieties, consisted of three levels : Red Sigambiri (V1), IPB 8G (V2) and IPB 9G (V3). The second factor was mulches consisted of four levels : No Mulch (M0), Silver Black Plastic Mulch (M1), Rice Straw Mulch (M2) and
Upland rice planting was carried out using seeds previously immersed in Dithane M-45 fungicide solution for 24 hours to prevent leaf rust and imbibition. The seeds were then dried until rice sprouts emerged (± 2 days), and planted in plots measuring 2 m x 2 m with a spacing of 20 cm x 20 cm. Silver black plastic mulch was prepared and installed before the planting; whilst rice straw mulch and
Leaf area (cm2)
Statistical analysis showed mulching had significant effect on the leaf area of the upland rice varieties. Treatment of varieties and interaction among the treatments however had no significant effect (Table
The different varieties of the upland rice had no significant effect on leaf area. This is because this research was conducted between July and September. Such period has high rainfall and many rainy days. Surtinah (2008) mentioned that high rainfall will inhibit photosynthesis and lower the temperature, and the rainfall has very significant effect on crop production. The overall amount of rainfall is important in determining crop yields. Another factor is sunlight, which determines the rate of photosynthesis and from this process carbohydrates will be produced. The more carbohydrates produced through photosynthesis, the higher will be the plant leaf area.
Number of productive tillers
Statistical analysis showed that mulching, varieties, and interactions among treatments had significant effects on the number of productive tillers (Table
The highest number of productive tillers (13.20 tillers) was found in the treatment with
The highest number of productive tillers was found in IPB 9B variety (13.10 tillers) and the lowest in Red Sigambiri variety (10.65 tillers). Makarim and Suhartatik (2009) found that the growth patterns of tillers in rice are affected by genetic varieties which influenced the number of tillers produced. Abdullah (2004) stated that rice varieties with short stems have many tillers and have the ability to produce more panicles per clump (about 20 panicles per clump) in contrast to the new rice varieties.
Interaction of IPB 9G variety with Silver Black Plastic Mulch produced the highest mean of productive tillers (Table
Weight of 1000 rice grains (g)
Statistical analysis showed that the upland rice varieties had significant effect on the weight of 1000 grains, while mulching and interaction among treatments had no significant effect (Table
Weight of 1000 grains is an indicator of sink strength, namely the ability of the organ sink or the ability of the seeds to attract assimilates from photosynthesis. The greater the strength of the sink, the more it will affect the assimilate proportions. The two main factors that influence sink strength in seeds are cell turgor and hormones (Sumardi, 2010).
The highest weight of 1000 grains was found in IPB 9G varieties (12.89 g), and the lowest was in IPB 8G (10.47 g). Setiobudi, Abdullah, Sembiring, and Wardana (2008) stated that the weight of 1000 grains was determined by genetic traits especially panicle length, panicle branches and grain differentiation. In this study, the high weight of 1000 grains in IPB 9G variety was affected internally by genetics and external derivatives which are the environmental factors such as the soil climate, light and biotic factors. Similarly, Eerens, Lucas, Easton, and White (1998) stated that the external factors could affect plant growth directly or indirectly, especially the light factor which plays a role for seed germination, yield weight, seedling growth, differentiation of various tissues and organs, and reproduction.
Mulching had no significant effect on the weight of 1000 grains. This is due to the role of mulch as a microclimate regulator, especially for radiation interception by plants and temperature which did not work well and affected the process of growth and seed filling. All plant metabolic activities are directly affected by temperature variations. Very low temperatures cause injury to plants due to cold and freezing, whilst very high temperatures make plants lacking of water and will stop to grow. In addition, metabolism process needs nutrients.
Production per plot (g)
Statistical analysis showed that the upland rice varieties had significant effect on production per plot, whilst mulching and interaction among treatments had no significant effects (Table
Mulching had no significant effect on the production per upland rice plot. It was suspected that mulching did not provide the optimal results because organic mulch was not sufficiently decomposed. Thus, the plastic mulch was unable to modify the nutrients and water needed by the rice varieties to grow and develop productively. Nasir (2002) stated that maximum yield will be achieved if a cultivar has achieved the optimum combination response to water, fertilizer, mulch and other cultivation practices. All of these input combinations are important in achieving high productivity.
The different varieties of the upland rice however have significant effects on the production per plot. The highest was found in IPB 9B with 958.33 g whilst the lowest was Red Sigambiri with 435.00 g. This was because the the former is a superior variety and has the potential to produce higher yield. Hatta (2011) stated that the number of productive tillers was related to yield. Better vegetative growth causes higher photosynthetic rate to produce more dry weight which is stored in the filled grains. An effort to increase growth and production is intensification by technological improvements and the use of superior varieties.
Mulching was only able to affect some growth parameters of the upland rice varieties namely leaf area and number of productive tillers. The treatment had no significant effect on upland rice yield. The use of Silver Black Plastic Mulch produced the lowest leaf area compared to A. Gangetica and rice straw, but produced the highest number of productive tillers.
The use of different upland rice varieties affected the growth and yield which were the number of productive tillers, weight of 1000 grains and production per plot. Variety IPB 9G produced high yield compared to Red Sigambiri and IPB 8G. On average, the highest weight of 1000 grains was IPB 9G followed by Red Sigambiri and IPB 8G.
Interaction treatment affected the growth of upland rice only on the number of productive tillers. The highest number of productive tillers was found in the interaction of IPB 9G variety and Silver Black Plastic Mulch whereas Red Sigambiri and IPB 8G produced the highest number of productive tillers with A. gangetica.
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30 March 2020
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Kusbiantoro, D., & Hanum, C. (2020). Growth And Yield Of Upland Rice By Mulching. In & N. Baba Rahim (Ed.), Multidisciplinary Research as Agent of Change for Industrial Revolution 4.0, vol 81. (pp. 76-83). European Publisher. https://doi.org/10.15405/epsbs.2020.03.03.10