  In this paper, we demonstrate that on an almost Hermitian manifold $(M^{2n},
J, ds^2)$, a 2-form $\varphi=S^*\Phi$, the pulling back of the K\"ahler form
$\Phi$ on the twistor bundle over $M^{2n}$, is non-degenerate if the squared
norm $|N|^2$ of the Nijenhuis tensor is less than $\frac{64}{5}$ when $n\geq 3$
or less than $16$ when $n=2$. As a corollary, there exists no orthogonal almost
complex structure on the standard sphere $(S^6, ds_0^2)$ with
$|N|^2<\frac{64}{5}$ everywhere.
