RÉSUMÉ
Aims: Influence of levels of phosphorus on yield components and yield of zero till maize in rice-maize (Zea mays L.) sequence.Methodology: Field experiment was conducted during two successive years at College of Agriculture, Rajendranagar, Hyderabad on rice-zero till maize sequence. The experiment was replicated thrice with 5 levels of P2O5 in rice and 3 levels of P2O5 in maize.Results: The direct application of 60 kg P2O5 ha-1 to maize recorded significantly higher value of yield components, grain and stover yield of maize over lower Phosphorus levels. The residual effect of 100% and /or 75% RDP (recommended dose of Phosphorus) applied to rice had a greater positive influence on the yield components and yield over lower phosphorus levels. The cumulative effect indicated that application of 100% RDP to both the crops and 75 % RDP to rice and 100% RDP to maize had a positive effect on maize and produced significantly greater yield components and yield over other phosphorus treatments.
RÉSUMÉ
The field experiment was carried out during 2018-19 at AICRP on Integrated Farming Systems, Regional Sugarcane and Rice Research Station, Rudrur in vertisols of Northern Telangana Zone, Telangana state, India. The experiment was performed with twelve cropping systems as treatments in Randomized Block Design (RBD) with three replications. The twelve combinations of cropping systems tested during kharif (June-October) and rabi (November – March) were rice-rice (check), maize-soybean(2:4)-tomato, maize-soybean (2:4) - rice, sunflower-chickpea (2:4), maize - chickpea, Bt cotton-soybean (1:2) on broadbed–sesame-groundnut(2:4), Bt cotton - sesame -blackgram (2:4), soybean-wheat, soybean-sunflower -chickpea (2:4), turmeric-sesame, turmeric-soybean (1:2) on flat bed-bajra and turmeric-soybean (1:2) on broadbed-sesame - blackgram (2:4).Cropping system turmeric-soybean(1:2 ) (on BBF) sesame – blackgram (2:4) recorded productivity in terms of rice equivalent yield of 23413kg ha-1 and production efficiency of 75.53Kg ha-1 day-1followed by sole turmeric-sesame (22597 kg REY ha-1 ) and 72.89Kg ha-1 day-1 and Bt.cotton+soybean (1:2) (on BBF) sesame+groundnut (2:4) (22568kg ha-1) and 75.23 Kg ha-1 day-1 over existing rice-rice (14395 kg REY ha-1 ) and 56.45Kg ha-1 day-1. Higher nutrient uptake was recorded with maize+soybean (2:4)–tomato system with 361.73 kg N ha-1, 114.43 kg P ha-1 and 318.89 kg K ha-1. Hence under nutrient stressed environment and low input management system maize+soybean (2:4) –tomato, can be recommended in comparision to existing rice-rice cropping system in irrigated situations for vertisols of Telangana.