In this case as well as using a natural plant food product for maize you will have to combine it with carbamide, nitrate and/or calcium to improve the plant's condition. 4- When the leaves start to get a darker green tone or simply get black the plant does not have enough phosphorus. In this case you should try to find a natural plant food product for maize that contains phosphate in different forms. The characteristic feature of lack or low levels of nitrogen on the ground include slow growth of plants, vegetables and fruits. In this case the best thing to do is to purchase a natural plant food product that has an important level of nitrogen. The ground can also have low levels of potassium or phosphorus and in that case you should get a natural fertiliser that has proportionate levels of N,K and P. With the natural fertiliser you will provide your plants with what they need and at the same time you won't leave waste that might go into streams and rivers. The reason is that the quantity of nitrogen present in this type of plant food is exactly what the plants require to develop in a good way. Moreover, the nitrogen is freed just as the plant begins to develop, in about fifteen days. Replacing inorganic products with farm natural plant food When planning to change the inorganic products you use to improve ground conditions for a more natural alternative, in particular farm plant food, you will not have a problem. However, you need to know that as you will be changing a habit, there might be a decrease in the quality and look of plants, but it will be for a short period. This type of plant food is made of various ingredients such as fish coating, algae concentrates and other sea-related things. The sea-related pellet plant food has small quantities of chemicals that are beneficial for the ground and plants. However, other ingredients are used to make pellet plant food. Desired features of commercial plant food When you purchase natural plant food in stores you need to read the labels very careful. The label should include a list of ingredients and the amount of each of them contained in the plant food. Most commercial plant food alternatives contain nitrogen, phosphorus and potassium because those are the substances plants need to develop in a good way.