Agricultural Science Digest

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Agricultural Science Digest, volume 41 issue 1 (march 2021) : 96-98

Rice Husk Ash as a Low Cost Soil Ameliorant for Abating Iron Toxicity in Lowland Rice

V. Mini1,*, S. Lekshmi2
1Onattukara Regional Agricultural Research Station, Kayamkulam- 690 502, Kerala, India.
2Rice Research Station, Moncompu-688 502, Kerala, India.
Cite article:- Mini V., Lekshmi S. (2020). Rice Husk Ash as a Low Cost Soil Ameliorant for Abating Iron Toxicity in Lowland Rice . Agricultural Science Digest. 41(1): 96-98. doi: 10.18805/ag.D-5194.
Background: The Fe toxicity is a perpetual problem of low lying poorly drained acid soils. It also affects the solubility and availability of most of the plant nutrients, by reducing toxic concentrations of iron, aluminum and manganese. To overcome these constraint, application of lime is inevitable but high cost of liming materials necessitate the use of low-cost, internally sourced, environmentally friendly and adoptable organic sources. In present study rice husk ash was used as a soil ameliorant in lieu of liming.

Methods: A field experiment was conducted at Rice Research Station, Moncompu during 2017-2018 with nine treatments replicated thrice in RBD using rice variety Uma. A customized formulation with composition of K (8.9 %), Mg (3.2 %), Ca (3.7 %), Zn (2.1 %), Mn (0.23 %), B (3.5 %) and Cu (0.96 %) was developed based on the available nutrient status of the region and crop requirement and used for supplementary foliar nutrition.

Result: It was found that treatment comprising of Soil test based RDF + Rice husk ash @ lime (based on pH) + foliar spray of 0.5 % solution of customized formulation @ 5 kg ha-1 as foliar application of 0.5 % solution in two splits at maximum tillering and panicle initiation stage was the best treatment in increasing yield by 23 % compared to recommended dose of lime and fertilizer application and B:C ratio increased from 1.53 to 1.91. Effect of rice husk ash in ameliorating soil acidity was found to be on par with application of lime based on pH in acid sulphate soils of Kuttanad zone. 
Promotion of organic farming through Navsari Agricultural University, Navsari had took the new initiative in 2009-10 on management and value addition of banana pseudostem under NAIP-II project. Banana pseudostem is an absolute waste. Novel organic liquid Nutrients have been developed from banana pseudostem comprising of 10 macro and micro nutrients and 2 hormones, which are naturally synthesized (Anonymous, 2010). Novel organic liquid nutrients internationally patented in year 2012 by Navsari Agricultural University, Navsari (Salunkhe et al., 2013). This product has been tested on number of crops and shown very good result in terms of growth, number of branches, initiation of flowering, number of fruit setting and reduce fruit drop in number of crops like mango (Patel et al., 2018), sapota, cucurbits, brinjal, okra (Chotaliya et al., 2018), watermelon, chilli, Indian bean, papaya, guava etc., which ultimately increase yield and quality as well as reduce cost of cultivation. For popularization of this technology from 2013-14 to 2018-19, various activities viz., trainings, demonstration, field days, delivering lectures as resource persons, group discussions, method demonstrations, agricultural technology dissemination week, group discussion, khedut shibir, on spot advocacy, farmers seminar, KVK at village and farmers visited to KVK, etc. were conducted at Krishi Vigyan Kendra, NAU, Vyara, Tapi. With this view to know the extent of adoption of Novel organic liquid nutrients in fruit and vegetable crops, a study was formulated to know the correlation of different factors and characteristics for adoption of the product.
A study was conducted in the Vyara, Valod, Songadh and Dolvan blocks of Tapi district of Gujarat through Krishi Vigyan Kendra, NAU, Vyara, Tapi during 2018-19. In the study, the sample size was of 100 respondent, who trained/ purchased/ front line demonstrations on novel organic liquid fertilizer purposively from KVK, Vyara, Tapi. Farmers were selected through stratified random sampling method. Level of knowledge and extent of adoption of practices of Novel organic liquid nutrients were the dependent variables. Among the independent variables, the socio-personal variables were age, land size, education, family type, family size, occupation, scientific orientation. Adoption was measured with the help of teachers made interview schedule. Score 1 was given for adoption and score 0 was given for non-adoption (Kunwar et al., 2015).
       
The data analysed with appropriate statistical tools such as frequency, percentage, mean, standard deviation and correlation analysis, which is used to quantify the association between two continuous variables (e.g. between an independent and a dependent variable or between two independent variables). The outcome variable is also called the response or dependent variable and the risk factors and confounders are called the predictors, or explanatory or independent variables (Nzomoi et al., 2007).
Profile of respondents
 
The data in Table 1 revealed that 59 per cent of the farmers belonged to middle age group, while 36 per cent and 5 per cent belonged to young age and old age group, respectively. It is evident from Table 1 that 8 per cent of the farmers were illiterate and 20 per cent of the farmers had education up to primary school, followed by secondary school 21 per cent, higher secondary school 30 per cent, diploma 4 per cent, graduate 13 per cent and post graduate 4 per cent. The data of Table 1 indicated that majority of 87 per cent farmers doing farming with animal husbandry. The data portrayed in Table 1 indicated that majority of 77 per cent farmers having land up to 2 ha. The information presented in Table 1 revealed that more than 66 per cent farmers had acquired trainings. However, remaining 33 per cent farmers had not received training.
 

Table 1: Effect of rice husk ash and supplementary foliar nutrition on yield and B:C ratio.


 
Level of knowledge
 
It is clear from the results of Table 2 that majority of 66 per cent farmers having medium level of knowledge about the use of Novel organic liquid fertilizer. Whereas, 13 per cent farmers had low and 21 per cent farmers had higher level knowledge.
 

Table 2: effect of rice husk ash and supplementary foliar nutrition on iron and silicon content in grain and straw.


 
Level of adoption
 
It is evident from the data inferred in Table 3 that majority of 76 per cent farmers had medium to higher level adoption. However, only 24 per cent of the farmers were in the low level of adoption.

@table3

Practice-wise adoption
 
An effort was also made to know the practice-wise extent of adoption about the Novel organic liquid fertilizer. The practices namely used for nutrients and hormones requirements as well as method of application were adopted by all the respondents. It is indicated from the data inferred in Table 4 that practices regarding doses and stages of application (fruiting stage) adopted by the farmers to the tune of 76 per cent and 81 per cent, respectively. It was interested to note that the use of Novel organic liquid nutrients in okra crop, after that in watermelon.
 
@table4
 
Relationship
 
The data portrayed in Table 5 indicated that education, training and knowledge were significantly associated with the adoption of Novel organic liquid nutrients by the farmers. However, age, occupation and land holding were associated not-significantly.
 
@table5
It is clearly indicated from the results of study that majority of the farmers under young to middle age group, educated up to primary to higher secondary. Agriculture and animal husbandry were the main occupation, having land up to 2.0 ha. Majority of farmers comes under medium to high level of knowledge and adoption. Out of selected 6 independent variables, three variables namely education, training and knowledge were significantly associated with adoption. On the basis of findings, it is clear that there must be intensive efforts to provide proper training to accelerate the rate of adoption. Not only that different programmes i.e. khedut shibir, field day, etc. also be organized to create the awareness among the farmers about the importance of Novel organic liquid nutrients.

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  3. Lekshmi, S. (2017). Effect of Soil Amelioration and Supplementary Foliar Nutrition on Rice Yield in Kuttanad, MSc. (Ag) thesis submitted to Kerala Agricultural University, Thrissur, 103p.

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  7. Sitio, J., Widodo and Barchia, F. (2007). The use of EM 4 and rice husk ash to improve the growth and yield of rice in peat soil (in Indonesia). J. Akta Agrosia. 7: 36-40.

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