Field experiments were conducted for 3 years to investigate an appropriate irrigation management strategy that would lead to increased cabbage productivity along with saving in irrigation water. Cabbage was grown with microsprinkler and drip irrigation methods with four irrigation levels based on crop evapotranspiration (ETc) as 0.8 ETc, 0.9 ETc, 1 ETc, and 1.1 ETc. It was found that cabbage crop performed better with the microsprinkler system than the drip system. All the growth-and yield-contributing characters in the microsprinkler irrigation method were significantly superior over drip irrigation. The maximum yield of cabbage was obtained by the microsprinkler method (37 t ha −1 ) with irrigation scheduling at 1 ETc followed by 0.9 ETc (35.5 t ha −1 ). However, highest water use efficiency (114 kg ha −1 mm −1 ) was obtained in drip irrigation with 0.9 ETc irrigation level, and the highest net income per mm of water (Rs 622) was obtained in drip irrigation with 1 ETc irrigation level.Microsprinkling gave 7.30% more yield of cabbage than the drip method, whereas the drip method saved 32% more water than the microsprinkler method. It is therefore recommended to adopt the microsprinkler irrigation method to obtain a potential yield of cabbage. However, when water is a limiting factor, it is recommended to grow cabbage with the drip irrigation method. K E Y W O R D Scabbage, India, irrigation levels, micro-irrigation, water productivity, water use efficiency RésuméDes expériences sur le terrain ont été menées pendant trois ans pour étudier une stratégie de gestion de l'irrigation appropriée qui entraînerait une augmentation de la productivité du chou ainsi qu'une économie d'eau d'irrigation. Le chou a été cultivé avec des méthodes d'irrigation par micro-aspersion et goutte à goutte avec quatre niveaux d'irrigation basés sur l'évapotranspiration des cultures (ETc) comme 0,8 ETc, 0,9 ETc, 1 ETc et 1,1 ETc. Il a été constaté que la récolte de chou fonctionnait mieux avec le système de micro-aspersion que le système goutte à goutte. Tous les caractères contribuant à la croissance et au * Performance du chou à différents niveaux d'irrigation avec des systèmes d'irrigation goutte à goutte et micro-aspersion
Crop productivity and nutrient use are mainly water restricted in semiarid regions. This study was conducted to find out whether the onion seed crop productivity could be elevated through drip fertigation. The effects of irrigation and fertigation levels on yield, yield components, quality and nutrient use of onion seed crop (Allium cepa L.) were investigated at MPKV Rahuri, western India on a sandy clay loam soil. Irrigation water applied at evapotranspiration (ETc) levels of 80% (I 1 ), 90% (I 2 ) and 100% (I 3 ) whereas, drip fertigation levels 60 %, 80 %, 100 % and 120 % of recommended dose (120:60:60 nitrogen, phosphorus, potassium (NPK )kg/ha) were investigated. Three-year experiment results showed no significant differences in number of seed/umbel, seed yield/umbel /plant, seed and straw yield ha −1 from the comparison between 100 % ETc and 90 % ETc. In fertigation, 120 and 100 % levels gave significantly higher values of yield components and seed yield than the 80 % and 60 % levels. The quality parameters were decreased with decrease in ETc, but, increased with increase in fertigation levels. Fertilizer use efficiency was highest in 60 % fertigation and then declined with the increase in fertigation levels. Irrigation at 100 % ETc and fertigation @ 120 % resulted into higher nutrient use but the Downloaded by [Nanyang Technological University] at 15:03 14 June 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT2 difference with 90 % ETc and 100 % fertigation was non significant. The 90 % ETc and 100 % fertigation dose (120:60:60 NPK kg/ha) appears a useful practice to increase onion seed productivity under the semi arid climate of western India.
A field study was conducted at experimental farm of Interfaculty Department of Irrigation Water Management, Post Graduate Institute, M.P.K.V., Rahuri, Maharashtra, India during Rabi season of 2014-15. The experiment was laid out in randomized block design with eight treatments and three replications. The treatments consisted of four levels of fertilizer application as 100%, 75%, 75% with foliar sprays and 50% recommended dose (RD) under drip fertigation (DF) and compared with conventional irrigation and conventional fertilizer application. The significantly higher yield (52.62 t ha-1) of tomato was obtained in DF with 100% RD and it was at par with DF with 75% RD + 3 foliar sprays, DF with 100% RD, N and K drip, P through soil and DF with 75% RD. The drip method had lowest water use (458.4 mm) as compared with 878.6 mm in surface irrigation method. The treatment consisting DF with 100% RD provided net seasonal income (Rs. 3,93,311 ha-1), net extra income over control (Rs.1,52,056 ha-1). The maximum B:C ratio (3.96) was observed in DI with 100% RD, N and K drip, P through soil followed by DF with 100% RD. The fertigation with 75% RD in 18 weekly splits as per schedule is the best treatment for improved growth, yield and water productivity of tomato (var. Abhinav) cultivated in silty clay loam soils of Western Maharashtra.
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