Which of the following statements regarding laterite soils of India are correct? 1. They are generally red in colour. 2. They are rich in nitrogen and potash. 3. They are well-developed in Rajasthan and UP. 4. Tapioca and cashew nuts grow well on these soils. Select the correct answer using the codes given below.

1. Laterite soils in India are formed under conditions of high temperature and heavy rainfall with alternate wet and dry periods, leading to intense leaching. 2. Statement 1 is correct. Due to the presence of iron oxides, formed through leaching, laterite soils are generally red in colour. 3. Statement 2 is incorrect. Because of intense leaching, laterite soils are generally poor in plant nutrients. They are particularly deficient in nitrogen, phosphate, lime, and magnesia. While they may contain potash, they are not typically described as 'rich' in it compared to their overall nutrient poverty. 4. Statement 3 is incorrect. Laterite soils are well-developed primarily in the high rainfall areas of the Western Ghats, Eastern Ghats, parts of Karnataka, Kerala, Tamil Nadu, Odisha, and some parts of the northeast. They are not characteristic soils of Rajasthan (which has mostly desert soils) or UP (which has predominantly alluvial soils). 5. Statement 4 is correct. Despite their general infertility, with proper manuring and irrigation, laterite soils can support certain crops. They are particularly suitable for plantation crops like tea, coffee, rubber, cashew nuts, and also tapioca. 6. Therefore, statements 1 and 4 are correct.