Browsing by Author "Elizabeth K Syriac"

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Bio efficacy of post emergence micro herbicides in transplanted rice (Oryza sativa L)
(Department of agronomy, College of agriculture, Vellayani, 2013) Rathod Nilesh Dayaram; Elizabeth K Syriac
Effect of soil and foliar application of N and P on the yield and quality of blackgram (Vigna Mungo (L) Hepper)
(Kerala Agricultural University, 1988) Elizabeth K Syriac; Chandrasekharan, P; Nair, V M
A field experiment conducted during the third crop season of 1981—'82 in the rice fallows of the Rice Research Station, Kayamkularn, to study the comparative efficiency of soils as well as foliar application of nitrogen, phosphorus and their combination on the growth, yield and quality of blackgram revealed that the grain yield was significantly increased by the combined application of nitrogen and phosphorus partly through soil and partly through foliage. The maximum grain yield (1631 kg/ha) and net profit (Rs. 3254.80) were recorded by the treatment in which both nitrogen and phosphorus (20 kg N and 30 kg P205/ha) were given 1/3 through soil as basal dose and 2/3 in two equal split doses through the foliage, at the vegetative phase and at flowering. Protein content of grain and grain protein yield were also significantly influenced by the treatments receiving both nitrogen and phosphorus partly through soil and partly through foliage.
Evaluation of the new generation herbicide penoxsulam in transplanted rice(Oryza sativa L.)
(Department of Agronomy, College of Agriculture, Vellayani, 2014) Sasna, S; Elizabeth K Syriac
The study entitled “Evaluation of the new generation herbicide penoxsulam in transplanted rice (Oryza sativa L.)” was conducted during the period, December 2012 to April 2013 at farmer’s field in Nemom block, Thiruvananthapuram district. The objective of the study was to assess the bio-efficacy of the post emergence micro herbicide penoxsulam in transplanted rice and to work out the economics. The experiment was laid out in randomised block design with eight treatments and three replications. Four doses of penoxsulam i.e. 17.5, 20.0, 22.5 and 25.0 g a.i ha-1 (T1 - T4 ), bispyribac sodium @ 30.0 g a.i ha-1 (T5 ), 2, 4 –D sodium salt @ 1 kg a.i ha-1 (T6), hand weeding twice (T7) and weedy check (T8) constituted the treatments. Study of the weed flora dynamics of experimental field indicated the dominance of broad leaved weeds (7 sp.), followed by sedges (3 sp.) and grasses (2 sp.) All the herbicide treatments reduced the population and biomass of weeds substantially over weedy check. The lowest density and dry weight of weeds and highest weed control efficiency was recorded with penoxsulam @ 25.0 g a.i ha-1 (T4) at all the stages of observation, viz., 20 DAT, 40 DAT and 60 DAT. With respect to density of weeds, T4 was found to be on par with T3 at 20, 40 and 60 DAT. Regarding dry weight of weeds, at 20 DAT, T4 was on par with T3 ; however, at 40 DAT, all other herbicide treatments were on par with T4. None of the herbicides produced any phytotoxic symptom on rice plant. Critical analysis of the growth factors indicated the favourable effect of weed control treatments especially penoxsulam @ 25.0 and 22.5 g a.i ha-1 on plant height at harvest, number of tillers at 40 and 60 DAT and dry matter production at harvest. All the weed control treatments significantly improved the yield attributes viz., number of productive tillers m-2, grain weight panicle-1 and significantly lowered the sterility percentage as compared to weedy check. Penoxsulam @ 22.5 g a.i ha-1(T3) registered highest grain yield (5404 kg ha-1), net income (Rs 49065 /- ha-1) and B:C ratio (1.67) which was on par with other doses of penoxsulam(T4 , T2 and T1) as well as bispyribac sodium @ 30.0 g a.i ha-1 (T5) and 2,4 - D sodium salt (T6). Even though hand weeding twice registered grain yield comparable to herbicide treatments, due to very high labour cost involved, net income and B:C ratio were significantly low for this treatment. The weedy check recorded significantly lower values for grain yield, net income and B:C ratio compared to herbicide treatments and the yield loss due to weeds in this treatment was 22.13 per cent. Enumeration of soil microbial population 6 days after herbicide spraying revealed that the herbicides caused an initial reduction in the population of bacteria; but, there was no significant variation in the population of fungi and actinomycets , compared to weedy check where the rhizosphere was undisturbed. Considering weed control efficiency, grain yield, net income and B:C ratio, the new generation herbicide penoxsulam @ 22.5 g a.i ha-1 at 10 DAT can be adjudged as the best treatment for weed management in transplanted rice.
Fertigation for precision farming in tomato (Solanum Iycopersicum L.)
(Department of Agronomy, College of Agriculture, vellayani, 2016) Amala, J; Elizabeth K Syriac
The investigation entitled “Fertigation for precision farming in tomato (Solanum lycopersicum L.)” was carried out at College of Agriculture, Vellayani during the period 2015-2016 to standardize a fertigation schedule for precision farming in tomato and to assess the impact of precision farming practices on growth and yield and also to work out the economics. The field experiment was conducted during the summer season of 2015 (February to June) in farmer’s field at Pirappancode, Thiruvananthapuram district. The experiment was laid out in split plot design with eight treatment combinations and two controls, with four replications. Four levels of nutrients (l1- 75 per cent RD of N and K, l2- 100 per cent RD of N and K, l3- 125 per cent RD of N and K, l4- 150 per cent RD of N and K) constituted the main plot treatments and two fertigation intervals (i1- fertigation once in four days, i2- fertigation once in eight days) constituted the sub plot treatments. The two control treatments were, control 1 (KAU ad hoc POP for precision farming) and Control 2 (KAU POP for conventional farming). The hybrid tomato Lakshmi grafted on wild brinjal was used for the study. Among different nutrient levels, l3 (125 per cent RD of N and K) recorded the highest DMP (219.42 g plant-1), number of fruits plant-1(33.67), fruit set percentage (62.77) , fruit yield (1.54 kg plant-1 and 42.36 t ha-1) and was significantly superior to other nutrient levels tested. Fertigation at four days interval (i1) recorded the highest LAI, DMP (224.21 g plant-1), number of fruits plant-1 (35.53), fruit set percentage (60.74) and fruit yield (1.61 kg plant-1 and 44.25 t ha-1) and was significantly superior to i2 (fertigation at eight days interval). Moisture studies indicated that both WUE and water productivity significantly varied with nutrient levels and fertigation intervals. The highest WUE (40.62 kg ha mm-1) and water productivity (5.26 kg ha mm-1) were observed at 125 per cent RD of N and K. Fertigation at four days interval (i1) registered significantly higher WUE and water productivity than i2. Application of 125 per cent RD of N and K (l3) recorded the highest root weight of 10.27 g and the highest root volume of 26.58 cm3 and was statistically on par with 150 and 100 per cent RD of N and K. The treatment i1 was significantly superior to i2 for all root characteristics. Uptake of N, P and K varied significantly with nutrient levels and fertigation intervals. The treatment l3 recorded the highest N, P and K uptake and it was statistically on par with l4. Fertigation at four days interval (i1) was significantly superior to i2, in nutrient uptake. Among different interactions, 125 per cent RD of N and K at 4 days interval (l3i1) registered the highest DMP (245.28 g plant-1) and was statistically on par with 150 per cent RD of N and K at four days interval (l4i1). Also, l3i1 recorded the highest fruit yield (1.92 kg plant-1 and 52.70 t ha-1) and number of pickings (7.33) and was significantly superior to other interactions studied. Economics of the study showed that l3i1 (125 per cent RD of N and K at four days interval) registered the highest net income of ₹ 6,61,515 ha-1 and B:C ratio of 2.69 and it was significantly superior to all other interactions. KAU ad hoc POP for precision farming (Control 1) was significantly superior to KAU POP for conventional farming (Control 2), for all growth attributes, yield attributes and yield. The treatment combination 125 per cent RD of N and K given as fertigation at four days interval (l3i1) was superior to control 1 and control 2 with respect to yield attributes, yield and economics. Based on the results of the present field investigation, it can be concluded that application of 125 per cent RD of N and K (93.75 kg N and 31.25 kg K ha-1) as urea and muriate of potash respectively, in 30 splits through fertigation at four days interval along with basal application of FYM @ 25 t ha-1 and P @ 40 kg ha-1 as rock phosphate is the best schedule for hybrid tomato under precision farming.
Herbicide mixtures for weed management in direct seeded puddled rice (Oryza sativa L.)
(Department of Agronomy,College of Agriculture, Vellayani, 2016) Sheeja K Raj; Elizabeth K Syriac
Impact of plant population and weed management practices on the performance of Basmati Rice
(Department of Agronomy, College of Agriculture, Vellayani, 2002) Jacob, D; Elizabeth K Syriac
Influence of the method of application of N and P on the growth, yield and quality of blackgram [Vigna mungo (L.) Hepper]
(Department of Agronomy, College of Agriculture, Vellayani, 1983) Elizabeth K Syriac; Chandrasekharan, P