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Balasore, India

Shahid M.,Indian Central Rice Research Institute | Nayak A.K.,Indian Central Rice Research Institute | Shukla A.K.,AICRP Micronutrients | Tripathi R.,Indian Central Rice Research Institute | And 6 more authors.
Clean - Soil, Air, Water | Year: 2014

Wetland rice in many humid tropical regions of Asia, Africa, and South America are affected by iron toxicity, which mainly occur due to increase in Fe(II) concentration in soil solution resulting from drop of redox potential arising from anaerobic situations in submerged rice fields. The high quantity of ferrous ions in the soil solution upsets the mineral element balance in rice plants and affects its growth. A field experiment was carried out in acidic laterite soil (pH 5.1) having 400mgkg-1 diethylene triamine pentaacetic acid extractable Fe for developing strategies to combat Fe toxicity and to study Fe, Zn, and Mn nutrition in rice. The treatments included four cultivars and six soil management options. Soil pH increased upon submergence and stabilized at 6.2 in compost treated plots and 6.8 in lime treated plots after eight weeks of flooding. Application of lime resulted significantly higher yields in all the four cultivars over control. Among the cultivars lowest Fe concentration both in grain and straw was recorded in tolerant as compared to susceptible cultivars. The ratio of Fe/Mn in rice plants was highest under control and reduced with Fe toxicity management treatments. It was further observed that Fe/Mn ratio of tolerant cultivars was lower as compared to susceptible cultivars irrespective of amendments. Similar relations were also recorded for Fe/Zn ratio under different Fe toxicity management interventions. Thus, the application of lime and limiting plant nutrients, such as K, Mn, and Zn along with tolerant cultivars could be important components of Fe toxicity management in Fe toxic acid lateritic soils. High quantity of ferrous ions in soil solution upsets the mineral element balance in rice plants and affects growth. A field experiment was carried out in acidic laterite soil. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Dash D.,Krishi Vigyan Kendra OUAT | Parida D.,AICRP on Groundnut | Panda P.K.,CSWCRTI Chalesar | Kumar A.,KVK Inc | And 3 more authors.
International Journal of Pharma and Bio Sciences | Year: 2011

The present investigation entitled, "Effect of organic and inorganic sources of nitrogen(N) on yield attributes and yield of rice (Oryza sativa)" was carried out at the Agricultural Research Farm, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi during Kharif seasons of 2001 and 2002, in agro-ecological zone V of India. The soil of experimental site was sandy clay loam in texture with normal pH, low in nitrogen and phosphorus and medium in organic carbon and potassium contents. The experiment was laid out in Randomised Block Design with nine treatments replicated thrice. The treatments were applied to rice crop during kharif season. Application of 120 kg N ha -1 through chemical fertilizer (T 9) and combination of D.S, P.M and C.W (T 8) increased effective tillers m -2as well as HI significantly as against the other N sources along with control (T 1) and remained at par to each other. However, highest number of effective tillers m -2, filled grains per panicle, 1000 grain test weight and HI were observed in the treatment receiving recommended doses of chemical fertilizer (T 9) followed by the treatment T 8 (@ 40 kg N ha -1 each source). Application of N through chemical fertilizer (T 9) brought about significant improvement in grain and straw yields of rice crop and established superiority over rest of the treatments. Among organic N sources, supplication of N through combination of D.S + P.M + C.W @ 40 kg N ha-1each (T 8) increased the grain and straw yield significantly as against the application of rest of the organic N sources and the control (T 1) except the straw yield due to incorporation of P.M alone (T 3) which remained at par.

Samant T.K.,Krishi Vigyan Kendra OUAT
Indian Journal of Agricultural Research | Year: 2015

The Hybrid rice Rajalaxmi recorded higher plant height(98.1 cm), effective tillers hill-1(21.5), Length of panicle(24.1 cm), grains panicle-1(248) and test weight(23.65 g) than the local check(HYV Lalat). The same also recorded grain yield 63.75 q ha-1 which is 56.53 % higher yield than local check(Lalat) with harvest index of 47.2 % over the years of study . In spite of increase in yield of improved technology the technological gap, extension gap and technology index existed which was 6.25 q ha-1, 23.05 q ha-1 and 8.93 % respectively. The improved technology of hybrid rice gave higher gross return of Rs. 88834 ha-1 with a benefit cost ratio of 1.88 and additional net return of Rs.25277 ha-1 as compared to local check . Hence the existing HYV Lalat can be replaced by Hybrid rice Rajalaxmi since it fits to the existing farming situation for higher productivity and income.

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