Get a soil test done.
With signs of interveinal chlorosis a soil test is warranted
Do you see the dark green veins within the leaves? This is your biggest problem, and we cannot diagnose this from a picture.
I consulted the internet for a more expansive explanation than I can spout off with. I found this:
"Chlorosis in maple leaves, which is the yellowing of leaves due to insufficient chlorophyll production, can be caused by a variety of factors. Identifying the specific cause of chlorosis in maple leaves often requires a careful examination of the tree's environment and a process of elimination. Here are some common causes of chlorosis in maple leaves:
- Nutrient Deficiencies: a. Iron Deficiency: Iron is essential for chlorophyll production. Poor soil drainage or high soil pH (alkaline soil) can limit iron uptake by the roots, leading to chlorosis. b. Nitrogen Deficiency: Inadequate nitrogen can also result in chlorosis. This may occur due to poor soil quality or competition with other plants for nutrients.
- Soil pH Imbalance: Maples prefer slightly acidic to neutral soils. If the soil is too alkaline (high pH), it can interfere with nutrient uptake, leading to chlorosis. Soil pH can be adjusted through soil amendments.
- Poor Drainage: Inadequate drainage can cause waterlogged soil, depriving roots of oxygen and impairing nutrient uptake. This can lead to chlorosis.
- Root Compaction: Soil compaction can restrict root growth and reduce the tree's ability to absorb nutrients and water. This can result from construction or heavy foot traffic around the tree.
- Root Damage: Physical damage to the tree's roots, such as during construction or digging, can disrupt nutrient and water uptake.
- Diseases: Maple trees can be susceptible to various diseases, such as root rot or verticillium wilt, which can impair nutrient uptake and lead to chlorosis.
- Pest Infestations: Insect pests, such as aphids, scale insects, or spider mites, can weaken the tree and affect its ability to produce chlorophyll.
- Environmental Stress: Extreme weather conditions, including drought, excessive moisture, or temperature extremes, can stress maple trees and cause chlorosis.
- Excessive Fertilization: Ironically, over-fertilizing with certain nutrients, such as phosphorus, can lead to nutrient imbalances and chlorosis.
- Chemical Contaminants: Exposure to herbicides or other chemicals in the soil or water can harm the tree's roots and lead to chlorosis.
To determine the specific cause of chlorosis in maple leaves, consider conducting a soil test to assess nutrient levels and pH, inspecting the roots for damage or compaction, and examining the overall health of the tree for signs of disease or pests. Once you identify the underlying issue, you can take appropriate steps to address it, which may include adjusting the soil pH, improving drainage, applying fertilizers or micronutrient treatments, or treating for diseases or pests. Consulting with a local arborist or horticulturist can also be helpful in diagnosing and treating chlorosis in maple trees."
Now that's a lot to consider. My best guess is that you have high pH soil, which causes several important minerals to become unavailable to the plant's roots, even though that mineral is present in the soil. Once you get that soil test done, we can advise you as to a good treatment plan.
How to get a soil sample? Take about 6 samples of the soil from that gravel pit you planted it in, ranging from close to the tree (two feet out) and up to 10 feet away. Sample in several radiating directions from the tree. Rake the gravel aside, then dig up a thin sample at least 6 inches deep. Mix your samples together, and then send a sample to the best local testing facility you can find. Most folks find that the local county extension agent will collect samples and send them off to an agricultural university for a good report. I use a private lab, because they give an excellent report, and do it much faster than any County Extension office. That service does come at a higher price, however.
https://midwestlabs.com/get-started
Just an observation: the tips of the branches seem to be burned a bit. This is normal with spring growth under a nutritional deficiency when the summer hits. Also notice that the youngest growth is also the most yellowed.
Get that soil tested, and don't rely on the instant tests sold at the local nursery.