ABSTRACT<br /><br />Weeds has become a big problem in system of rice intensification (SRI), integrated crop management (ICM) and conventional cultivation systems. The objective of the research was to study the dominancy and potential of harmful effect of weed in these three cultivation systems. The research was conducted at Sukamandi research station of Indonesian Center for Rice Research, Subang, from November 2013 to April 2014 during rainy season. The experiment was arranged in a split plot design with four replications. The cultivation systems was main plot consisted of system of rice intensification (SRI), integrated crop management (ICM) and conventional system. The weeding techniques as subplot consisted of no weeding, manual weeding, mechanical weeding and chemical weeding. The result showed that based on dry mass of weeds the highest risk of weed was exhibited at SRI with total dry mass of weed 51.53 g m-2 (0.5 ton ha-1) and the lowest was at conventional system with 32.45 g m-2 (0.3 ton ha-1). Proper weed control increased rice production by 28.9% for SRI, by 29.4% for ICM and by 14.6% for conventional cultivation systems. <br /><br />Keywords: dominant, weeding technique, SRI, ICM, conventional system
Research on improving fertilization technology of upland rice is still being developed. This research aimed to examine the most efficient technology fertilization (NPK and Urea) to increase the productivity of upland rice. Research had been conducted in upland rice fields, located at Ploso Kerep, Indramayu District, in MT I 2012/2013 designed in split plot with three replications. The main plot was the level of NPK fertilizer, consisting of (A) Without NPK (0 kg / ha), (B) NPK 100 kg / ha, (C) NPK 200 kg / ha, and (D) NPK 300 kg / Ha, and as subplots are (1) Without Urea 0 kg / ha, (2) Urea 100 kg / ha, (3) Urea 200 kg / ha and (4) Urea 300 kg / ha. The results showed that NPK and Urea can improve growth and yield of upland rice. NPK fertilizer with 300 kg / ha has produced the highest number of panicles per hill (12.07 grain panicles), while at Urea 200 kg / ha resulted in the highest panicle number of 11.54 grain panicles. The highest dry grain yield (5.78 t / ha) was obtained at NPK 300 kg / ha with an average increase of 100 kg / ha NPK reaching 370 kg / ha. The combination of NPK 300 kg / ha and with 300 kg urea / ha, the weight of 1000 urea 300 kg / ha can be increased to 7.58% when compared without fertilizing.
Modified ratoon salibu is a technique of increasing crop index and production of rice. This research was aimed to knew to obtain information on some varieties appropriate to modified ratoon salibu. The experiment was conducted from April 2017 to March 2018 at Farmers Field of Tanah Datar District of West Sumatra. The investigation was arranged in a randomized complete block design (RCBD) with 14 treatments and three replications. The treatment consists of 14 varieties, i.e., Hipa 8, Hipa 18, Hipa 19, Hipa Jatim 2, Inpari 6, Inpari 10, Inpari 19, Inpari 43, Ketan Ciasem, Ketan Grendel, Kebo, Cisokan, Batang Piaman, and Ciherang. The result showed that the hybrid rice variety more tiller than the inbred and local variety. Batang Piaman variety was the tallest variety on modified ratoon salibu. Some types were appropriate on modified ratoon salibu until salibu two and yield same with Batang Piaman, i.e., Inpari 6, Inpari 10, Inpari 19, Inpari 43, Ketan Ciasem, and Cisokan. Percentage of the ratooning ability of rice variety 12,71% to 80,20 %.
Abstract. Zarwazi LM, Junaedi A, Sopandie D, Sugiyanta, Purwono, Sakagami J-I. 2022. Prospective rice varieties for high yield performance on modified ratoon salibu cultivation. Biodiversitas 23: 1065-1071. Modified Ratoon Salibu (MRS) differs from ratoon (Conventional Ratoon, CR). This research aims to investigate some rice varieties re-grown as CR and MRS after main crops are harvested. The experiment was conducted at Kuningan Experimental Station of Indonesian Center for Rice Research, using rice varieties as the main plot (Hipa 18, Hipa 19, Inpari 42, Inpari 43, IPB 3S, and Batang Piaman), and ratoon cultivation system as a sub-plot (CR and MRS), evaluated in the first (1) and second (2) generation after the main crop. The result showed that the growth character of MRS on plant height, stem diameter, blade-leaf size, root volume was significantly higher than that of CR. Furthermore, the yield component and yield were also significantly higher in MRS than CR. The CR yielded about 56.9 and 10.8 % of the main crops for R1 and CR2, respectively, whereas MRS yielded 121.0 and 93.8% of the main crops for MRS1 and MRS2, respectively. This finding could be a scientifically proven of local wisdom “Salibu” indigenous knowledge in Tanah Datar District of West Sumatra, Indonesia. Therefore, MRS could be recommended for suitable varieties and environmental conditions as the sustainable farming alternative to increase Cropping Index while still reaching high productivity.
developed. This study aims to obtain optimum fertilization technology in several new high yielding rice varieties with high yield potential in new open fields. Research has been carried out in new openings in two locations, namely in West Kalimantan Province, with the criteria for new openings in the first location are new openings less than 5 years old and the second location is openings aged 5-10 years after opening. The study refers to a split plot design with 3 replications. The main plot is fertilization level consisting of (R1) Fertilizer dosage recommendations for new openings, (R2) PTT recommended dosage fertilizers, (R3) Fertilizer dosage way of farmers (local), as plots are (V1) Inpara 9, (V2) Inpari 22, (V3) Inpari 30. Research results show that in new openings of land aged <5 years, inpari 22 has a significant effect on the formation of panicles per clump and percent grains of contents while inpari 30 has an effect on increasing the weight of 1000 grains. In newly opened land of 5-10 years, inpari 22 had a significant effect on the formation of panicles per clump while inpari 30 had an effect on increasing percent grains of content and weight of 1000 grains. The dosage treatment with recommended fertilizer dosages for new openings and inpari 22 has a tendency to produce the highest MPD results in new openings with land age <5 years. The dosage treatment with the recommended PTT fertilizer dosage and inpari 30 variety has a tendency to produce the highest MPD results in new openings with a land age of 5-10 years.
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