The correct answer is Rice-wheat.
Rice-wheat rotation is a common cropping system in the Indo-Gangetic Plains, including Haryana. It is a two-crop system in which rice is grown in the kharif season (June-October) and wheat is grown in the rabi season (November-March).
Rice-wheat rotation is a very efficient system of cropping. It allows farmers to take advantage of the different growing seasons of the two crops. Rice is a water-intensive crop, while wheat is a relatively dry crop. This means that farmers can grow rice in the wet season and wheat in the dry season.
Rice-wheat rotation also helps to maintain soil fertility. Rice is a heavy feeder of nitrogen, while wheat is a heavy feeder of phosphorus. This means that the two crops complement each other, and the soil is not depleted of any one nutrient.
Rice-wheat rotation is also a good way to control pests and diseases. Rice is susceptible to a number of pests and diseases, while wheat is less susceptible. By rotating the two crops, farmers can help to break the life cycle of pests and diseases.
However, rice-wheat rotation also has some disadvantages. It is a very intensive system of cropping, and it requires a lot of inputs, such as water, fertilizer, and pesticides. It also contributes to soil degradation and waterlogging.
Overall, rice-wheat rotation is a very efficient system of cropping. It allows farmers to take advantage of the different growing seasons of the two crops, and it helps to maintain soil fertility. However, it is a very intensive system of cropping, and it requires a lot of inputs.