Avocado alternate year yield bearing

The solution is in not feeding the wrong parts of the crop

Alternate year yield bearing whereby off years of small yields of large fruit are followed by on years of large yields of small fruit is a recurring problem for avocado growers. Here we discuss why it happens, and how to reduce the problem.

Avocados grow three crops at once, the crop we harvest, the flowers for the next crop, and the budwood for the crop after. Branches in different parts of the growth cycle compete for resources with each other. Getting even production across seasons relies upon the crop allocating equal emphasis to vegetative growth (shoots) and reproductive growth (flowers for next yield and fruit development for current yield).

Alternate year yield bearing occurs when the crop allocates too much resource to one area of growth causing a lack of development in one of the others.

 

Alternate year yield bearing is an agricultural phenomenon, not a natural process.

Alternate year yield bering rarely occurs in nature and is largely created by the way that we farm crops in combination with prevailing weather conditions. To understand why we need to look at how conventional nitrogen inputs influence where the plant grows.

The largest single influence on where the plant allocates its growth is the level and form of nitrogen available to the crop. Not all forms have the same effect, with nitrates generating one type of growth, and amine/ammonium forms generating a different type of growth.

Alternate year yield bering rarely occurs in nature and is largely created by the way that we farm crops in combination with prevailing weather conditions. To understand why we need to look at how conventional nitrogen inputs influence where the plant grows.

However farmers do not benefit from the ‘amine effect’ as the nitrogen they apply in this form is not stable and gets taken up mostly as nitrate – giving a ‘nitrate effect’ instead.

Alternate year yield bering rarely occurs in nature and is largely created by the way that we farm crops in combination with prevailing weather conditions. To understand why we need to look at how conventional nitrogen inputs influence where the plant grows.

When we play this through successive seasons we get a ‘boom and bust’ cropping cycle. It also results in much of the N applied been pruned back off the tree each year – losing potential yield.

 

Stabilised amine nitrogen offers a way to produce a more balanced ‘amine effect’ on growth habit.

Lono developed by Levity Crop Science holds nitrogen in the amine form, and can influence growth partitioning (where the crop allocates growth). Used on perennial tree crops alongside conventional nitrogen inputs it helps the crop distribute growth more evenly between vegetative and reproductive development. Giving less apical dominance, shorter internodes and more even fruit and flower development.

The diagram here illustrates how shortening internodes, allows more fruit per unit length of branch, less pruning and a better canopy shape. Growing the plant in the right places yields benefits to all three parts of the growing cycle. Holding and sizing current fruit, setting and retaining flowers and producing leaf and buds for following crops.

Recommendations

  • Apply Lono regularly through the season at 5L per Ha monthly either via drip or foliar applications.

www.levitycropscience.com/lono