The experiment comprising of four levels of phosphorus, i.e., 0, 20, 40 and 60 kg ha -1 and three levels of sulphur, i.e., 0, 15 and 30 kg ha -1 , was conducted during summer of 2015-16 to investigate the interaction effect of phosphorus and sulphur application on nutrients uptake and yield of black gram cv. Uttara. The treatments were laid in randomized block design (Factorial) with three replications. The results revealed utmost concentration and uptake of phosphorus in seed (0.376% and 3.59 kg ha -1 ) and stover (0.266% and 6.38 kg ha -1 ) and sulphur in seed (0.397% and 3.79 kg ha -1 ) and stover (0.134% and 3.21 kg ha -1 ) with combined application of phosphorus 60 kg and sulphur 30 kg ha -1 , indicating synergistic effect of phosphorus and sulphur on nutrient uptake, respectively. The results also revealed that combined application of phosphorus and sulphur showed synergistic effect on seed and stover yield of black gram with increasing levels of phosphorus and sulphur up to highest level as both the nutrients mutually help absorption and utilization by black gram probably due to balanced nutrition. The seed and stover yield were 955.50 and 2398.30 kg ha -1 with combined application of phosphorus 60 kg and sulphur 30 kg ha -1 . The yield attributes of black gram viz., plant height, number of pods plant -1 and 100 seeds weight also increased significantly with increasing levels of phosphorus and sulphur up to highest level and the optimum values were recorded with combined application of phosphorus 60 kg and sulphur 30 kg ha -1 . However, non-significant response of phosphorus and sulphur application has been observed in case of plant population (m -2 ).

The experiment comprising of four levels of phosphorus, i.e., 0, 20, 40 and 60 kg ha-1 and three levels of sulphur, i.e., 0, 15 and 30 kg ha-1, was conducted during summer of 2015-16 to investigate the effect of phosphorus and sulphur application on their dynamics in soil under the crop of black gram cv. Uttara. The treatments were laid out in randomized block design (factorial) and replicated three times. The results reveal that the available and organic phosphorus (kg ha-1) significantly increased with each successive application of phosphorus in soil up to highest level (60 kg ha-1) at 20 days after sowing (DAS) of black gram, while it showed decreasing trend with time intervals of 40 DAS and at maturity of black gram. The application of successive doses of sulphur had no significant effect on available and organic phosphorus at each time interval. Similarly, significant increase has also been recorded in available and organic sulphur (kg ha-1) in soil with each successive application of sulphur up to 30 kg ha-1 at 20 DAS of black gram, thereafter, it showed decreasing trend. The application of successive doses of phosphorus had no significant effect on available and organic sulphur at each time interval. Number of nodules plant-1 also increased significantly with increasing levels of phosphorus and sulphur up to highest level and the optimum values were recorded with combined application of phosphorus 60 kg ha-1 and sulphur 30 kg ha-1.

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The experiment comprising of four levels of phosphorus, i.e., 0, 20, 40 and 60 kg ha-1 and four levels of zinc, i.e., 0, 5, 10 and 15 kg ha-1 was conducted to investigate the interaction effect of phosphorus and zinc fertilization on yield and yield attributes of green gram [Vigna radiata (L.) Wilczek] cv. SML-668. The treatments were laid out in Randomized Block Design (Factorial) with three replications. The results revealed that plant height, number of pods plant-1, 1000 seed weight, seed and stover yield were increased significantly up to 60 kg ha-1 phosphorus and 10 kg ha-1 zinc treatment levels. Further increase in zinc levels found to decrease the yield and yield attributing traits, indicating antagonistic effect of phosphorus and zinc on each other. The highest plant height, number of pods plant-1, 1000 seed weight, seed and stover yield (at 60 kg P ha-1 and 10 kg Zn ha-1 treatment level) were 48.70 cm, 27.15, 32.70 g, 957.25 and 2398.30 kg ha-1, respectively. Thus, interaction of phosphorus and zinc was significant for all the growth and yield attributing parameters.

Zero tillage is the most imperative pillar of conservation agriculture. Time itself demands adoption of conservation agriculture. For both farmers and the environment, it is a win-win operation. Today, the world is facing a population boom and there is an immediate need to improve agricultural productivity and overall food production on a sustainable basis without sacrificing the atmosphere and natural resources. Though green breakthrough technology, implemented in 1966-67, contributed to food security but extensive agriculture, inefficient and unbalanced use of fertilisers, high-yielding crops, use of heavy machinery, over-cultivation, etc., caused deterioration of soil health and quality and increased air, soil and water contamination for more than five decades. The approach to relating tillage to the physical conditions of the soil is very comprehensive. Tillage helps to create a favourable soil condition for plant growth, but in the long run it has a detrimental impact on soil properties, structure and ultimately on the environment. In the long term, zero tillage has the ability to boost the physical properties and environment of the soil. Holding all of these under consideration, this analysis is compiled to create a perfect tillage scheme, i.e. zero tillage, which eliminates the detrimental effects of tillage and retains land resources and eventually contributes to sustainable agriculture. The influence on the physical properties of the soil, however, depends on the location-specific biophysical environment, such as soil texture, predominant temperature patterns, site characteristics, adoption period, seasonal rainfall variation, and the intrinsic status of soil fertility.