For a monsoon seasonal crop with less investment, pulses like mooing deal (green gram) and oared deal (black gram) are excellent choices. These crops have several advantages:

Why Pulses (Moong Dal and Urd Dal)?
Lower Input Costs:

Pulses generally require fewer inputs like fertilizers and pesticides compared to other crops. They also do not need heavy irrigation, relying primarily on monsoon rains.
Short Growth Duration:

Mooing deals and ad deals have a short growing period, typically around 60-70 days, allowing farmers to harvest them quickly and possibly grow another crop in the same season.
Soil Fertility Improvement:

Pulses are nitrogen-fixing crops, meaning they improve soil fertility by fixing atmospheric nitrogen into the soil, reducing the need for synthetic fertilizers for subsequent crops.
Good Market Demand:

There is consistent market demand for pulses in India, as they are a staple in Indian diets. Prices for these crops are relatively stable, offering a good return on investment.
Resistance to Diseases and Pests:

Pulses are generally more resistant to diseases and pests compared to other crops like vegetables or cereals, reducing the need for expensive pest control measures.
Other Options:
Millets (Bajra, Jowar): Millets are another good choice for monsoon farming with low investment. They are drought-resistant and can grow well with minimal water and inputs.
Groundnut: Groundnut is another crop that can be grown during the monsoon with moderate investment and provides good returns, especially if there’s access to a local market.
Conclusion:
Moong dal and urd dal are among the best monsoon crops for farmers looking to minimize investment while still ensuring a good return. These crops are low-maintenance, improve soil health, and have strong market demand, making them ideal for small to medium-scale farmers.