A field study was conducted during the kharif season of 2022 to investigate the effect of different rice production systems on yield attributes, crop yields and economics. The experiment was laid in randomized block design with three replications, encompassing seven treatments. Three treatments involved transplanting methods viz., system of rice intensification (SRI), mechanical transplanting and conventional transplanting. The remaining four treatments were direct seeded rice (DSR) treatments viz., wet DSR (drum seeding), wet DSR (broadcasting), dry converted wet rice (broadcasting) and dry converted wet rice (line sowing). The results showed that the yield attributes viz. panicles m-2, panicle length and weight, filled grains panicle-1, fertility percentage and grain yield were significantly higher in wet DSR (drum seeding) followed by dry converted wet rice (line sowing), SRI method. In terms of economic analysis, wet DSR (drum seeding) exhibited the highest gross returns, net returns and benefit-cost ratio (B:C ratio). On the other hand, the dry converted wet rice (broadcasting) method showcased the lowest yield attributes, grain yield, net returns, and B:C ratio among all the crop establishment methods. Based on the findings, it is recommended to adopt either wet DSR (drum seeding), dry converted wet rice (line sowing) and SRI method during the kharif season to achieve maximum yield and economic returns.
An experiment was conducted at the Indian Institute of Rice Research (IIRR) farm, ICRISAT for three consecutive kharif and rabi seasons from 2016 to 2018 to evaluate varieties under System of Rice Intensification (SRI) and Normal Transplanting (NTP) method. A total of 46 cultivars including hybrids (10), High yielding varieties (HYVs) (28) and elite cultures (8) were tested. Data pooled over years and seasons indicated that SRI was significantly superior in terms of number of tillers, number of panicles per square meter, days for 50% flowering and grain yield with low inputs viz; energy, man power and irrigation. Hybrids, HYVs and elite culture recorded a grain yield of 6.54 t/ha, 5.65 t/ha and 5.50 t/ha under SRI as compared to 5.13, 4.59 and 4.58 t/ha, respectively under NTP, thereby indicating that SRI excelled NTP in grain yield. Pooled data of six seasons, three years among the cultivars indicated that SRI recorded higher grain yield (5.90 t/ha) over NTP (4.77 t/ha) with mean percent grain yield increase of 23.4%. Intensification method was also promising over conventional transplanting in terms of energy use efficiency (SRI 10.17% over NTP 6.20%) and economy parameters (B:C ratio 2.0 in SRI and 1.20 in NTP). Water productivity was higher in SRI (7.08 kg/mm/ha) than NTP (3.93 kg/mm/ha).
The current study reveals the effect of inconsistent nitrogen treatments on yield and yield attributes in the System of Rice Intensification (SRI) and conventional practices when compared during Kharif 2018 and 2019. Growth parameters like plant height, tillers per plant, yield attributes viz; length of panicle, number of filled and unfilled grains per panicle, test weight, straw yield, and harvest index were compared under both conventional and SRI methods. Subplots comprising four nitrogen management practices like control (N1),100% organic (N2), 50% organic+50% inorganic (N3) 100% inorganic (N4) were taken. The maximal yield was recorded in SRI (5265 kg ha-1) than conventional cultivation i.e., Normal Transplanting (4168 kg ha-1). Among the nitrogen management practices 50% inorganic + 50% organic treatments (N3) showed better performance when compared to 100% inorganic (N4), followed by 100% organic (N2) and control (N1). The pooled analysis of grain yield was observed to be highest in the N3 treatment (5551 kg ha-1), followed by N4 (5185 kg ha-1), N2 (4988 kg ha-1), and control N1 (3142 kg ha-1). A similar pattern was also seen pertaining to the yield attributes.
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